The question is, why do we need SQL Pagination when we already have built-in paging functionality in Grid View or JQuery Data table.

Answer is èSometimes it's not a good habit to load all the data over the network, but instead to transfer only the data required, to improve performance. For that we have SQL paging. Pass only a Page Index and Page Size to load the required data.

To do this, I created the following Stored Procedure:
=============================================
-- Author: Nilachal Sethi
-- Create Date: Oct 31, 2022
-- Description: Get full List By Pagination
-- =============================================
CREATE PROCEDURE [dbo].[ListData]

       @PageSize as int=1000,
       @Caret as int=0,
       @Option varchar(100) = Null

AS
BEGIN

   Declare @TotalRecord int
SELECT @TotalRecord =COUNT(ID) FROM JobOrder
                     OFFSET @PageSize * (@Caret)ROWS FETCH NEXT @PageSize ROWS ONLY


              SELECT @TotalRecord AS TotalRecord,* FROM JobOrder
                     ORDER BY DateTaken DESC
                     OFFSET @PageSize * (@Caret)ROWS FETCH NEXT @PageSize ROWS ONLY
     END;

Now the Controller is:
[HttpGet]
public IActionResult GetJobOrderGrid(int? pagesize, int? caret)
{
    string responseString = "";
    var response = webApiMethodsForDBAction.GetAsyncCall(webApiUrl +"URL?Pagesize=" + pagesize + "&Caret=" + caret);
    int StatusCode = Convert.ToInt32(response.StatusCode);
    if (StatusCode == 200)
    {
        responseString = response.Content.ReadAsStringAsync().Result;

    }
    return Json(responseString);
}

Now the View is:
<div id="JobGrid">
    <input type="hidden" id="hidcurrentindexemp" value="0" />
    <input type="hidden" id="hidemppagesize" value="10" />
    <input type="hidden" id="hiddenTotalRecord" value="" />
    <div class="row">
        <div class="col-md-12 m-grid__item">

            <div id="JobDiv" class="">

            </div>
            <div class="clearfix"></div>
            <div class="pagination-content clearfix" id="qemp"></div>

        </div>
    </div>
</div>
<script src="@Url.Content(" ~/MainCustomer/js/FullCustomer.js")"></script>

<script type="text/javascript">
    $(document).ready(function () {
            GetJobOrderList();
    });
</script>

Now the JQuery is:
For making Table And Pagination
function GetJobOrderList() {
    $.ajax({
        url: '/Area/Controller/ActionName',
        type: "GET",
        data: { pagesize: $('#hidemppagesize').val(), caret: $('#hidcurrentindexemp').val() },
        dataType: "json",
        async: true,
        beforeSend: function () {
            $("#divLoading").show();
        },
        success: function (data) {

            var Job = JSON.parse(data);
            if (Job === '') {
                window.location.reload();
            }
            var JobList = Job.thisList;
            var TotalRecord = Job.thisList[0].TotalRecords;
            var job_id = Job.thisList[0].Id;
            $('#hiddenTotalRecord').val(TotalRecord);
            var grid = '';
            grid += '<div class="main-container table-responsive table-container"><table class="table table-striped table-hover table-bordered" id="JobOrderTable"><thead> <tr><th>Action</th><th>Job Title</th><th >Customer Name </th><th>Stages </th><th>Start Date</th><th>Location</th><th>End Client</th><th>#Position</th><th>Status </th></tr> </thead>';
            grid += '<tbody>';
            if (data === null) {
                grid += '<tr><td colspan="9" >No Records Found.<td></tr>';
            }
            else {
                $.each(JobList, function (d, value) {
                    grid += ' <tr><td>' + (value.JobTitle === "" ? "N/A" : value.JobTitle) + '</td><td>' + (value.CustomerName === "" ? "N/A" : value.CustomerName) + '</td><td>' + (value.JoborderStage === "" ? "N/A" : value.JoborderStage) + '</td><td>' + (value.FormattedStartDate === "" ? "N/A" : value.FormattedStartDate) + '</td><td>' + (value.Location === null ? "N/A" : value.Location) + '</td><td>' + (value.Positions === "" ? "N/A" : value.Positions) + '</td><td>' + (value.IsActive === "Active" ? "" : "") + '</td></tr>';
                });
            }
            grid += '</tbody></table>';
            Pagination($('#hiddenTotalRecord').val(), $("#hidcurrentindexemp").val(), $("#hidemppagesize").val(), "#qemp", "qemp");
            $("#JobDiv").html(grid);
            $("#divLoading").hide();
        },
        error: function (xhr, textStatus) {
            if (xhr.status === 401) { window.location.reload(); }
            else {
                    $.notify('please try again!', "error");
                $("#divLoading").hide();
            }
        }
    });
}

For Click Page Function
function Search_qemp(index) {
    $("#hidcurrentindexemp").val(index);
    GetJobOrderList();
}

Main Pagination JS:
function Pagination(totalrecord, currentindex, pagesize, div, Type) {
    currentindex = parseInt(currentindex);
    totalrecord = parseInt(totalrecord);
    pagesize = parseInt(pagesize);
    var pagestring = '';
    $(div).html("");
    var pagerlink = Math.ceil(totalrecord / pagesize);
    var lastindex = pagerlink - 1;
    if (totalrecord === 0) {
        $(div).append('<p>Displaying 0 out of 0 items </p>');
    }
    else if (totalrecord > 0) {
        if (currentindex === lastindex) {
            if (currentindex === 0) {
                $(div).append('<p>Displaying ' + 1 + ' to ' + totalrecord + ' out of ' + totalrecord + ' items </p>');
            }
            else {
                $(div).append('<p>Displaying ' + parseInt(1 + (pagesize * (currentindex - 1) + parseInt(pagesize))) + ' to ' + totalrecord + ' out of ' + totalrecord + ' items </p>')
            }
        }
        else {
            $(div).append('<p>Displaying ' + parseInt(pagesize * currentindex + 1) + ' to ' + parseInt(pagesize * currentindex + parseInt(pagesize)) + ' out of ' + totalrecord + ' items </p>')
        }
        $(div).append('');
        if (totalrecord === 0) {
            pagestring = pagestring + '<li class="paginate_button page-item"><a class="page-link number">First</a></li><li class="paginate_button page-item"><a class="page-link number">Previous</a></li>' +
                '<li class="paginate_button page-item"> No Record Found </li><li class="paginate_button page-item"><a class="page-link number">Next</a></li><li class="paginate_button page-item"><a class="page-link number">Last</a></li>';
        }
        else {
            if (currentindex === 0) {
                pagestring = pagestring + '<li class="paginate_button page-item"><a class="page-link number">First</a></li>' +
                    '<li class="paginate_button page-item"><a class="page-link number">Previous</a></li>';
            }
            else {
                pagestring = pagestring + '<li class="paginate_button page-item"><a class="page-link number" onclick="Search_' + Type + '(0);">First</a></li>' +
                    '<li class="paginate_button page-item"><a class="page-link number" onclick="Search_' + Type + '(' + parseInt(currentindex - 1) + ');">Previous</a></li>';
            }
            var counter = 0;
            var intial = 0;
            if (parseInt(currentindex) < 5) {
                intial = 0;
            }
            else {
                intial = parseInt(currentindex) - 3;
            }
            for (var i = intial; i < pagerlink; i++) {
                var j = i + 1;
                if (i === currentindex) {
                    pagestring = pagestring + '<li class="paginate_button page-item number active"> <a class="page-link number" value="' + j + '">' + j + '</a></li>';
                }
                else {
                    pagestring = pagestring + '<li class="paginate_button page-item"> <a class="page-link number" onclick="Search_' + Type + '(' + i + ');" value="' + j + '">' + j + '</a> </li>';
                }
                if (counter === 5)
                    break;
                counter++;
            }
            if (currentindex === lastindex) {
                pagestring = pagestring + '<li class="paginate_button page-item"><a class="page-link number">Next</a></li>' +
                    '<li class="paginate_button page-item"><a class="page-link number">Last</a></li>';
            }
            else {
                var nextindex = (parseInt(currentindex) + 1);
                pagestring = pagestring + '<li class="paginate_button page-item"><a class="page-link number" onclick="Search_' + Type + '(' + nextindex + ');">Next</a></li>' +
                    '<li class="paginate_button page-item"><a class="page-link number" onclick="Search_' + Type + '(' + lastindex + ');">Last</a></li>';
            }
        }
        pagestring = '<div class="pagination-right"><nav><ul class="pagination float-md-right float-lg-right">' + pagestring + '</ul></nav></div>';
        $(div).append(pagestring);
    }
}

Now run the application.
Here we go…..

If you have any problem then please let me know.

The previous article, View Variables in .NET MVC, planned to discuss View Variables for both .NET MVC and .NET Core MVC. However, after finishing the .NET MVC part, I realized that the article is too long if I add another part for .NET Core. Therefore, I separate that part into this new article. So, the content structure will be exactly the same as the previous one for .NET MVC.

This will be the contents of this article,
    .NET Core MVC
        Setup Environment for Code Testing
        What ViewBag, ViewData, TempData, and Session are
        How ViewBag, ViewData, TempData, and Session Work
            ViewBag and ViewData
            TempData
            Session
        Difference between .NET MVC and .NET Core MVC for View Variables
            .NET MVC TempData supported by Session by Default
            .NET Core MVC TempData supported by CookieTempDataProvider by default
            .NET Core MVC TempData supported by Session after Session Enabled

A - Setup MVC Environment for Code Testing
Step 1 - Create a .NET Core MVC app
We use the current version of Visual Studio 2019 16.9.4 and .NET Framework 4.8 to build the app,

Start Visual Studio and select Create a new project.

• In the Create a new project dialog, select ASP.NET Core Web App (Model-View-Controller) > Next.
• In the Configure your new project dialog, enter Core MVC for Project name > Next
• In the Additional Information dialog, select .NET 5.0 > Create

Step 2 - Add ViewBag, ViewData, TempData, and Session
In Controller, update HomeController/Index action,
public class HomeController: Controller {
    private readonly ILogger < HomeController > _logger;
    public HomeController(ILogger < HomeController > logger) {
        _logger = logger;
    }
    public IActionResult Index() {
        List < string > Student = new List < string > ();
        Student.Add("Peter");
        Student.Add("Scott");
        Student.Add("Mark");
        this.ViewData["Student"] = Student;
        this.ViewBag.Student = Student;
        this.TempData["Student"] = Student;
        //this.Session["Student"] = Student;
        return View();
    }......
}

Note
Different from .NET MVC, where the Session State is supported by default, in .NET Core MVC, the Session State is not supported by default before we add it into the app. So, at this point, before we add the Session state, the Session will not work.  We will discuss this point, especially in Section D.

In View/Homw/Index.cshtml,

@{
    ViewData["Title"] = "Home Page";
}

<div class="text-center">
    <h1 class="display-4">Welcome</h1>
    <p>Learn about <a href="https://docs.microsoft.com/aspnet/core">building Web apps with ASP.NET Core</a>.</p>
</div>

<br>
<br>

<ul>
    <b>ViewBag</b>
    @foreach (var student in ViewBag.Student)
    {
        <li>@student</li>
    }
</ul>
<ul>
    <b>ViewData</b>
    @foreach (var student in ViewData["Student"] as List<string>)
    {
        <li>@student</li>
    }

</ul>
<ul>
    <b>TempData</b>
    @foreach (var student in TempData["Student"] as List<string>)
    {
        <li>@student</li>
    }
</ul>
@*<ul>
    <b>Session</b>
    @foreach (var student in Session["Student"] as List<string>)
    {
        <li>@student</li>
    }
</ul>*@

Note
The Session Variable in the view comments out, too.

B - What ViewBag, ViewData, TempData, and Session are
ViewBag, ViewData, TempData, and Session are the options to send value from controller to view or to other action method/pages.

1. They are the properties of Controller in MVC Core
Like .NET MVC, in .NET Core MVC, ViewBag, ViewData, TempData, and Session are the properties of the Controller Class.

However, different from .NET MVC, where ViewBag, ViewData, and TempData are the properties of ControllerBase class, which is the parent of the Controller Class; while the Session is the property of Controller class. In .NET Core MVC, they are opposite. ViewBag, ViewData, TempData belong to Controller class directly,

While the Session (HttpContext) is the property of ControllerBase class,

2. Type
They are all the type of Dictionary with the string as key, except ViewBag is dynamic type:
    ViewData --- public Microsoft.AspNetCore.Mvc.ViewFeatures.ViewDataDictionary ViewData { get; set; }
    ViewBag --- public dynamic ViewBag { get; }
    TempData --- public Microsoft.AspNetCore.Mvc.ViewFeatures.ITempDataDictionary TempData { get; set; }
    Session --- public Microsoft.AspNetCore.Http.HttpContext HttpContext { get; }

Note:
ViewBag is a wrapper over ViewData and allows to store and retrieve values using object-property syntax rather than key-value syntax used by dictionary objects. It does so using the dynamic data type feature of .NET.

C - How ViewBag, ViewData, TempData, and Session Work
This part, they are similar to what they are in .NET MVC, we just repeat the conclusion and skip the analysis, and then we open another session D to discuss the difference between .NET MVC and .NET Core MVC.

1. ViewBag and ViewData
They can be used to pass data from controller to view, one way only in the same request.
The difference between ViewBag and ViewData,
    ViewData
        If passing string into ViewData then no need to typecast
        If the passing object in ViewData then you need to typecast it but before that, you need to check if it is not null
    ViewBag
        ViewBag's a dynamic type so not necessary to typecast

2. TempData
TempData is used to transfer data from view to controller, controller to view, or from one action method to another action method of the same or a different controller.

TempData stores the data temporarily and automatically removes it after retrieving a value. i.e., It can be retrieved once, and only once. Finally, we should mention,

    TempData saves into the session so on the expiration of session data loss;
    TempData removes a key value once accessed, you can still keep it for the subsequent request by calling TempData.Keep() method.
    TempData is usually used to pass error messages or something similar.

3. Session
    Session stores data into session
    The session is not similar to TempData to access but you can read as many time as you want
    The session never becomes null until or unless session timeout or session expires.
    The session is not a good practice to use. Used very frequently or store big data, it hits performance

D - Difference between .NET MVC and .NET Core MVC for View Variables
1. The cookie-based TempData provider is used by default to store TempData in cookies.
We know that in .NET MVC TempData is stored in Session state by default. This means the web application must have sessions enabled. However, in .NET Core MVC, the session state is not enabled by default. Luckily, .NET Core 2.0+ provides two TempData providers - Cookie-based and Session State-based while the cookie-based provider is used by default.

TempData providers --- MS

The cookie-based TempData provider is used by default to store TempData in cookies.

The cookie data is encrypted using IDataProtector, encoded with Base64UrlTextEncoder, then chunked. The maximum cookie size is less than 4096 bytes due to encryption and chunking. The cookie data isn't compressed because compressing encrypted data can lead to security problems such as the CRIME and BREACH attacks. For more information on the cookie-based TempData provider, see CookieTempDataProvider.

2. Configure the TempData provider[ref]
The cookie-based TempData provider is enabled by default.
To enable the session-based TempData provider, use the AddSessionStateTempDataProvider extension method. Only one call AddSessionStateTempDataProvider is required.
In Startup.cs,
public void ConfigureServices(IServiceCollection services)
{
    services.AddControllersWithViews();

    services.AddMvc()
         .AddSessionStateTempDataProvider();
    services.AddSession();
}

public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
    ......

    app.UseSession();

    app.UseEndpoints(endpoints =>
    {
        endpoints.MapDefaultControllerRoute();
        endpoints.MapRazorPages();
    });
}

3. Verifications
.NET MVC
Run the app with F12 tools and locate the cookies option. The following figure (Firefox) shows the cookie used by TempData for storing the values. In Firefox, after the app running, type fn F12, under Storage/Cookies, Click the link, you will See: Name: ASP.NET_SessionID (if you run a different app, you probably need to right-click the link and delete all existing cookies),

Click ASP.NET_SeccionId, on the right, you will see the TampData is supported by Session (by default) for .NET MVC,

.NET Core MVC: for default TempData Provider,
Repeat the process above for the .NET Core MVC app,

TempData is supported by CookieTempDataProvider by default for .NET Core MVC,

.NET Core MVC: with Session State
Repeat the process above for the .NET Core MVC app with Session enabled,

TempData is supported by Session for .NET Core MVC after configuration to enable Session and using SessionStateTempDataProvider,

Use the following to create an ASP.NET MVC APP with a WCF Service using an ADO.NET Entity Data Model:
SQL Server DB -> WCF Service (ORM) -> MVC Application -> User (Browser).

This small app works in a 4-tier architecture as in the following:
    User Tier
    MVC app Tier
    WCF Service Tier
    SQL Server Tier

Project 1: WCF Project
Step 1
Go to VS 2012 and select "File" -> "New Website" then select "WCF Service" then provide the name “WcfMvc”.

Click "OK".

Step 2
Go to the Solution Explorer then go to "WcfMvc application" then right-click on it then seelct "Add" -> "Add new item" -> "Add ADO .Net Entity data model". Then click the "Add" button then place the file in the App_code Folder.

Step 3
Then the Entity Data Model Wizard will be shown. Select "Generate data from database" then click the "Next" button .

Step 4
Choose your data connection. I’m selecting My “ran” database of SqlServer 2012.
Activate the radio button “Yes include the sensitive data in the connection string”.
Save the connection string in the config file by enabling the check box “Save entity connection setting in web.config as:“ then click the "Next" button.

Or

go to the new connection and create your connection then provide the server name then provide the authentication type then select either Windows Authentication or SQL Authentication then provide the database name then click the "Ok" button. A new connection will then be generated.

Activate the Radio Button “Yes include the sensitive data in the connection string”.

Save the connection string in the config file by enabling the check box “save entity connection setting in web.config as: “ then click the "Next" button.

Step 5
Choose which database object you want in your model.

I’m selecting the “Customer” table. The table definition is as follows:
Create table customer
Custno int constraint pk primary key,
custname varchar(30) not null,
custcity varchar(30),
custbalance money);

You can use the above table or create your own table and use it

Then provide a Model Namespace of your choice.. I’m using “ranjeet” Namespace.

Click the "Finish" button.

Please ensure that in the Solution Explorer under the App_code folder the Model.edmx file has been created.

Your entity data model is ready for use.

Step 6
Go to Solution Explorer then expand the App_code Folder then go to the Iservice.cs file.

Step 7
Delete the Getdata() and GetDataUsingDataContract() methods.

Then

I’m writing one method GetCustomer() as follows.

Step 8
Then go to the Sevice.cs file and implement the method declared in the IService.cs interface.

In the Service.cs file right-click the Iservice Interface then select "Implement Interface" -> "Implement Interface".

Delete the already present method in the Service.cs the file.

And write the following code in the “public List<customer> GetCustomer()” method.

“ranEntities1” is a class name given when the connection is created.

Step 9
Open the Service.svc file and now run the project.
A new window will open; copy the URL present in that window and paste it into any text file. This URL will be used in the next project.

Project 2: MVC Application 4
Step 1
Ensure that the WCF project is open then start another instance of VS 2012. Then go to "File" -> "New" -> "Project..." then create an ASP.NET MVC 4 Web Application. Name it “MvcWcfApplication” then click "ok" Button. Then select the Project Template “Internet Application” then click the "Ok" button.

Step 2
Create a Proxy using “Add Service Reference” by right-clicking on MvcWcfApplication in the Solution Explorer.

(Note: Proxy is a class that converts a local request into a remote request.)

A new window will open. Paste the URL that you copied from the WcfMvc project into the Address TextBox then click "Go".

In other words, a proxy class is created successfully..

(Caution: if it has been created and in the project you can’t use the ServiceReference1 namespace Pl then don’t worry; it is a VS 2012 Automation Error. To solve it go to the Solution Explorer then select ServiceReference1 then right-click on it then select "Configure Service Reference". A new window will open then in it uncheck the “Reuse types in referenced assemblies” checkbox..)

A serviceReference1 will added into your project.

Step 3
Now add a new Controller then in Solution Explorer seelct "Controller" then right-click on it then select "Add Controller" (Ctrl+m, Ctrl+c).

Name it DbController. Click the "Add" button.

Step 4
Add the following code in the DbController.cs file.

Please build the project.

Step 5
Now right-click inside the Index() Method then select "Add View" (Ctrl+m, Ctrl+v) then click on “Create a Strongly Typed View” checkbox then select the Model Class we created, in other words “customer (MvcWcfApplication.ServiceReference1)” then select "Scaffold template List"then click the "Add" button.

Step 6
Run the application.
In the browser type: http://localhost:<Port>/Db

And see the results. All the data in the customer table is shown below the using WCF Service.

If you like this then please comment below.

Today I will show you how to generate an excel file from a list of objects in C#. To do this, several plugins allow you to do this work in a global way. In this work, I will try to create a very simple and generic method to generate an excel file from a list of objects whatever their nature.

Step 1
Create a new ASP.NET MVC project.

Give a name to this project. for example "ExcelGeneratingApp".

Choose the MVC type.

Step 2

Create a class "ExcelLib.cs" in the models folder of the application.

Step 3

Add "ClosedXML" library from Nuget Package Manager.

Add class named "Employee.cs" for example.
using System.ComponentModel;
namespace ExcelGeneratingApp.Models
{
public class Employee
{
[DisplayName("Identity number")]
public int ID { get; set; }
[DisplayName("Full name")]
public string Name { get; set; }
[DisplayName("Age")]
public int Age { get; set; }
[DisplayName("Salary")]
public float Salary { get; set; }
[DisplayName("Department name")]
public string Department { get; set; }

}
}

​Add an "addHeader" method to "ExcelLib.cs" class. This method allows to add and style header of the table in excel file.
using ClosedXML.Excel;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
namespace ExcelGeneratingApp.Models
{
public class ExcelLib
{
// Default Constructor.
public ExcelLib() { }
// Method for adding Header and Title of the table containing List of object values.
public IXLWorksheet addHeader(XLWorkbook wb, List<Object> objs, string title,  string fontFamily = "Sakkal Majalla", string color = "#3498DB")
{
// Sheet initialisation.
var ws = wb.Worksheets.Add("nomDeLaListe").SetTabColor(XLColor.UaBlue);
// font choice.
ws.Style.Font.FontName = fontFamily;
ws.Style.Font.SetFontSize(13);
ws.Style.Alignment.Horizontal = XLAlignmentHorizontalValues.Center;
ws.Style.Alignment.WrapText = true;
Object obj = objs.FirstOrDefault();
// Add the model fields to the header of the excel file.
int totalOfFields = obj.GetType().GetProperties().Length; // number of fields in the object.
int numberOfFields = 0;
// Adding the title of table in excel file.
ws.Range(ws.Cell(4, 4), ws.Cell(4, totalOfFields + 3)).Merge().Value = title;
ws.Range(ws.Cell(4, 4), ws.Cell(4, totalOfFields + 3)).Merge().Style.Fill.BackgroundColor = XLColor.FromHtml(color); ;
ws.Range(ws.Cell(4, 4), ws.Cell(4, totalOfFields + 3)).Style.Alignment.Horizontal = XLAlignmentHorizontalValues.Center;
ws.Range(ws.Cell(4, 4), ws.Cell(4, totalOfFields + 3)).Style.Font.Bold = true;
ws.Range(ws.Cell(4, 4), ws.Cell(4, totalOfFields + 3)).Style.Font.FontColor = XLColor.WhiteSmoke;
ws.Range(ws.Cell(4, 4), ws.Cell(4, totalOfFields + 3)).Style.Font.FontSize = 18;
//Looping all propeties of the object.
foreach (var prop in obj.GetType().GetProperties())
{
        var displayNameAttribute = prop.GetCustomAttributes(typeof(DisplayNameAttribute), false);
        string displayName = prop.Name;
        if (displayNameAttribute.Count() != 0)
        {
            displayName = (displayNameAttribute[0] as DisplayNameAttribute).DisplayName;
        }
        numberOfFields++;
        ws.Cell(5, totalOfFields - numberOfFields + 4).Value = displayName;
        ws.Cell(5, totalOfFields - numberOfFields + 4).Style.Border.BottomBorder = XLBorderStyleValues.Thin;
        ws.Cell(5, totalOfFields - numberOfFields + 4).Style.Border.LeftBorder = XLBorderStyleValues.Thin;
        ws.Cell(5, totalOfFields - numberOfFields + 4).Style.Border.RightBorder = XLBorderStyleValues.Thin;
        ws.Cell(5, totalOfFields - numberOfFields + 4).Style.Border.TopBorder = XLBorderStyleValues.Thin;
        ws.Column(totalOfFields - numberOfFields + 4).Width = 30;
        ws.Column(totalOfFields - numberOfFields + 4).Style.Font.Bold = true;
}
ws.Range(ws.Cell(5, 4), ws.Cell(5, totalOfFields + 3)).SetAutoFilter();
return ws;
}
}
}

Then add "addBody" method to the "ExcelLib.cs" class.
This method allows to add the list of objects "objs" content to the table in excel file.
It merges the cells of the first column containing the same values.
public IXLWorksheet addBody(IXLWorksheet ws, List<Object> objs)
{
int numberOfFields = 0;
int numberOfRecords = 0;
Object obj = objs.FirstOrDefault();
int totalOfFields = obj.GetType().GetProperties().Length;
string previousValue = "";
int indexOfPreviousValue = 0;

foreach (var item in objs.ToList())
{
  numberOfFields = 0;
  Type myType = item.GetType();
  IList<PropertyInfo> props = new List<PropertyInfo>(myType.GetProperties());

  foreach (PropertyInfo prop in props)
  {
      object propValue = prop.GetValue(item, null);

      numberOfFields++;
      ws.Cell(6 + numberOfRecords, totalOfFields - numberOfFields + 4).Value = propValue;

      ws.Cell(6 + numberOfRecords, totalOfFields - numberOfFields + 4).Style.Font.Bold = true;

      ws.Cell(6 + numberOfRecords, totalOfFields - numberOfFields + 4).Style.Border.BottomBorder = XLBorderStyleValues.Thin;
      ws.Cell(6 + numberOfRecords, totalOfFields - numberOfFields + 4).Style.Border.LeftBorder = XLBorderStyleValues.Thin;
      ws.Cell(6 + numberOfRecords, totalOfFields - numberOfFields + 4).Style.Border.RightBorder = XLBorderStyleValues.Thin;
      ws.Cell(6 + numberOfRecords, totalOfFields - numberOfFields + 4).Style.Border.TopBorder = XLBorderStyleValues.Thin;

      if (numberOfFields == 1 && numberOfRecords == 0)
      {
          previousValue = propValue.ToString();
      }
      else
      {
          if (numberOfFields == 1)
          {
              if (previousValue == propValue.ToString())
              {
                  ws.Range(ws.Cell(6 + numberOfRecords - (1 + indexOfPreviousValue), totalOfFields - numberOfFields + 4), ws.Cell(6 + numberOfRecords, totalOfFields - numberOfFields + 4)).Merge().Value = propValue.ToString();

                  ws.Range(ws.Cell(6 + numberOfRecords - (1 + indexOfPreviousValue), totalOfFields - numberOfFields + 4), ws.Cell(6 + numberOfRecords, totalOfFields - numberOfFields + 4)).Merge().Style.Alignment.Horizontal = XLAlignmentHorizontalValues.Center;
                  ws.Range(ws.Cell(6 + numberOfRecords - (1 + indexOfPreviousValue), totalOfFields - numberOfFields + 4), ws.Cell(6 + numberOfRecords, totalOfFields - numberOfFields + 4)).Merge().Style.Alignment.Vertical = XLAlignmentVerticalValues.Center;
                  indexOfPreviousValue++;
              }
              else
              {
                  previousValue = propValue.ToString();
                  indexOfPreviousValue = 0;
              }
          }

      }


  }
  numberOfRecords++;
}

return ws;
}

Then add a "Generate" method for generating the excel file.
public void Generate(List<Object> objs, string title, string fontFamily = "Sakkal Majalla", string color = "#3498DB")
{
// Workbook creation.
using (XLWorkbook wb = new XLWorkbook())
{
        var ws = addHeader(wb, objs, title);
            ws = addBody(ws, objs);
            wb.SaveAs("C://TestExcelGen.xlsx");
}
}

Step 4
To test this method, we will add some code to the Home controller.
public ActionResult Index()
{
List<Employee> employees = new List<Employee>();
employees.Add(new Employee() { ID = 100 ,Name="PETER", Age=32,Salary=12000,Department="INFO"}) ;
employees.Add(new Employee() { ID = 200 ,Name="SCOTT", Age=24,Salary=10000,Department="CIVIL"}) ;
employees.Add(new Employee() { ID = 300 ,Name="ADAM", Age=20,Salary=11000,Department="INDUS"}) ;
employees.Add(new Employee() { ID = 400 ,Name="ETHAN", Age=21,Salary=9000,Department="INFO"}) ;
ExcelLib excel = new ExcelLib();

excel.Generate(employees.Cast<object>().ToList(), "List of employees");

return View();
}

The full ExcelLib.cs content:
using ClosedXML.Excel;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.IO;
using System.Linq;
using System.Reflection;

namespace ExcelGeneratingApp.Models
{
public class ExcelLib
{
// Default Constructor.
public ExcelLib() { }
// Method for adding Header and Title of the table containing List of object values.
public IXLWorksheet addHeader(XLWorkbook wb, List<Object> objs, string title,  string fontFamily = "Sakkal Majalla", string color = "#3498DB")
{
// Sheet initialisation.
var ws = wb.Worksheets.Add("nomDeLaListe").SetTabColor(XLColor.UaBlue);
// font choice.
ws.Style.Font.FontName = fontFamily;
ws.Style.Font.SetFontSize(13);
ws.Style.Alignment.Horizontal = XLAlignmentHorizontalValues.Center;
ws.Style.Alignment.WrapText = true;
Object obj = objs.FirstOrDefault();
// Add the model fields to the header of the excel file.
int totalOfFields = obj.GetType().GetProperties().Length; // number of fields in the object.
int numberOfFields = 0;
// Adding the title of table in excel file.
ws.Range(ws.Cell(4, 4), ws.Cell(4, totalOfFields + 3)).Merge().Value = title;
ws.Range(ws.Cell(4, 4), ws.Cell(4, totalOfFields + 3)).Merge().Style.Fill.BackgroundColor = XLColor.FromHtml(color); ;
ws.Range(ws.Cell(4, 4), ws.Cell(4, totalOfFields + 3)).Style.Alignment.Horizontal = XLAlignmentHorizontalValues.Center;
ws.Range(ws.Cell(4, 4), ws.Cell(4, totalOfFields + 3)).Style.Font.Bold = true;
ws.Range(ws.Cell(4, 4), ws.Cell(4, totalOfFields + 3)).Style.Font.FontColor = XLColor.WhiteSmoke;
ws.Range(ws.Cell(4, 4), ws.Cell(4, totalOfFields + 3)).Style.Font.FontSize = 18;
//Looping all propeties of the object.
foreach (var prop in obj.GetType().GetProperties())
{
        var displayNameAttribute = prop.GetCustomAttributes(typeof(DisplayNameAttribute), false);
        string displayName = prop.Name;
        if (displayNameAttribute.Count() != 0)
        {
            displayName = (displayNameAttribute[0] as DisplayNameAttribute).DisplayName;
        }
        numberOfFields++;
        ws.Cell(5, totalOfFields - numberOfFields + 4).Value = displayName;
        ws.Cell(5, totalOfFields - numberOfFields + 4).Style.Border.BottomBorder = XLBorderStyleValues.Thin;
        ws.Cell(5, totalOfFields - numberOfFields + 4).Style.Border.LeftBorder = XLBorderStyleValues.Thin;
        ws.Cell(5, totalOfFields - numberOfFields + 4).Style.Border.RightBorder = XLBorderStyleValues.Thin;
        ws.Cell(5, totalOfFields - numberOfFields + 4).Style.Border.TopBorder = XLBorderStyleValues.Thin;
        ws.Column(totalOfFields - numberOfFields + 4).Width = 30;
        ws.Column(totalOfFields - numberOfFields + 4).Style.Font.Bold = true;
}
ws.Range(ws.Cell(5, 4), ws.Cell(5, totalOfFields + 3)).SetAutoFilter();
return ws;
}
public IXLWorksheet addBody(IXLWorksheet ws, List<Object> objs)
{
int numberOfFields = 0;
int numberOfRecords = 0;
Object obj = objs.FirstOrDefault();
int totalOfFields = obj.GetType().GetProperties().Length;
string previousValue = "";
int indexOfPreviousValue = 0;

foreach (var item in objs.ToList())
{
    numberOfFields = 0;
    Type myType = item.GetType();
    IList<PropertyInfo> props = new List<PropertyInfo>(myType.GetProperties());

    foreach (PropertyInfo prop in props)
    {
        object propValue = prop.GetValue(item, null);
        numberOfFields++;
        ws.Cell(6 + numberOfRecords, totalOfFields - numberOfFields + 4).Value = propValue;
        ws.Cell(6 + numberOfRecords, totalOfFields - numberOfFields + 4).Style.Font.Bold = true;
        ws.Cell(6 + numberOfRecords, totalOfFields - numberOfFields + 4).Style.Border.BottomBorder = XLBorderStyleValues.Thin;
        ws.Cell(6 + numberOfRecords, totalOfFields - numberOfFields + 4).Style.Border.LeftBorder = XLBorderStyleValues.Thin;
        ws.Cell(6 + numberOfRecords, totalOfFields - numberOfFields + 4).Style.Border.RightBorder = XLBorderStyleValues.Thin;
        ws.Cell(6 + numberOfRecords, totalOfFields - numberOfFields + 4).Style.Border.TopBorder = XLBorderStyleValues.Thin;

        if (numberOfFields == 1 && numberOfRecords == 0)
        {
            previousValue = propValue.ToString();
        }
        else
        {
            if (numberOfFields == 1)
            {
                if (previousValue == propValue.ToString())
                {
                    ws.Range(ws.Cell(6 + numberOfRecords - (1 + indexOfPreviousValue), totalOfFields - numberOfFields + 4), ws.Cell(6 + numberOfRecords, totalOfFields - numberOfFields + 4)).Merge().Value = propValue.ToString();

                    ws.Range(ws.Cell(6 + numberOfRecords - (1 + indexOfPreviousValue), totalOfFields - numberOfFields + 4), ws.Cell(6 + numberOfRecords, totalOfFields - numberOfFields + 4)).Merge().Style.Alignment.Horizontal = XLAlignmentHorizontalValues.Center;
                    ws.Range(ws.Cell(6 + numberOfRecords - (1 + indexOfPreviousValue), totalOfFields - numberOfFields + 4), ws.Cell(6 + numberOfRecords, totalOfFields - numberOfFields + 4)).Merge().Style.Alignment.Vertical = XLAlignmentVerticalValues.Center;
                    indexOfPreviousValue++;
                }
                else
                {
                    previousValue = propValue.ToString();
                    indexOfPreviousValue = 0;
                }
            }
        }
    }
    numberOfRecords++;
}
return ws;
}
public void Generate(List<Object> objs, string title, string fontFamily = "Sakkal Majalla", string color = "#3498DB")
{
// Workbook creation.
using (XLWorkbook wb = new XLWorkbook())
{
        var ws = addHeader(wb, objs, title);
            ws = addBody(ws, objs);
            wb.SaveAs("C://TestExcelGen.xlsx");
}
}
}
}

NB: You can download all project source code from my github page.

Conclusion
I think the procedure is very clear with snapshots. If you have found any mistake in concept, please do comment. Your comments will make me perfect in the future.
Thanks for reading.

All of us are beginners & all of us face the performance issue while fetching huge data from the database. One of the solutions is that we can bring a small piece of data (how much data we require to show) and we can achieve with Jquery DataTable. By default Jquery DataTable will bring all the data from Backend and Bind into the Table, but we don't want all the records at one go.

For this, we can go with Server Side Pagination with Jquery DataTable

There are many articles on Server Side Pagination on the internet, But max of them used "context.Request.Form" for getting the DataTable Properties for eg: context.Request.Form["draw"], context.Request.Form["start"]. But most of the time it gets null and we struggle for getting the values
In this article, we can achieve the Server side pagination with object with Post methods

Let's Start with the Database, For this I'm using Northwind Sample Database, you can download this database from
https://github.com/microsoft/sql-server-samples/tree/master/samples/databases/northwind-pubs

Once you added the database in the SQL you will find the Employees table with 10-15 Records, for this article I have added 576 records

Now here is the stored procedure for getting employees data

In this SP we are passing 4 parameters  
CREATE procedure [dbo].[getEmployeeList]
(
@page INT = 0,
@size INT =10,
@sort nvarchar(50) ='EmployeeId asc',
@totalrow INT  ='50'
)
AS
BEGIN
DECLARE @offset INT
DECLARE @newsize INT
DECLARE @sql NVARCHAR(MAX)

IF(@page=0)
BEGIN
SET @offset = @page
SET @newsize = @size
END
ELSE
BEGIN
SET @offset = @page+1
SET @newsize = @size-1
END
SET NOCOUNT ON
SET @sql = '
WITH OrderedSet AS
(
SELECT *, ROW_NUMBER() OVER (ORDER BY ' + @sort + ') AS ''Index''
FROM [dbo].Employees
)
SELECT * FROM OrderedSet WHERE [Index] BETWEEN ' + CONVERT(NVARCHAR(12), @offset) + ' AND ' + CONVERT(NVARCHAR(12), (@offset + @newsize))
EXECUTE (@sql)
SET @totalrow = (SELECT COUNT(*) FROM Employees)
select @totalrow
END

In MVC c# I have added Pagination.cs class like below
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace ServerSidePagination.Models
{
public class Pagination
{
public DatatablePostData data { get; set; }
}
public class DatatablePostData
{
public int draw { get; set; }
public int start { get; set; }
public int length { get; set; }
public List<Column> columns { get; set; }
public Search search { get; set; }
public List<Order> order { get; set; }
}

public class Column
{
public string data { get; set; }
public string name { get; set; }
public string searchable { get; set; }
public string orderable { get; set; }
public Search search { get; set; }
}

public class Search
{
public string value { get; set; }
public string regex { get; set; }
}

public class Order
{
public int column { get; set; }
public string dir { get; set; }
}
public class DTResponse
{
public int recordsTotal { get; set; }
public int recordsFiltered { get; set; }
public string data { get; set; }
}
}

Controller with action method for View Page (Add View page for paginationExample method)
public ActionResult paginationExample()
{
return View();
}

Controller with action method like below for getting the Employees data
[HttpPost]
public JsonResult GetEmployeeData(Pagination pagination)
{
SqlDataAdapter sqlDataAdapter = new SqlDataAdapter();
DataSet ds = new DataSet();
DTResponse DTResponse = new DTResponse();
try
{
using (SqlConnection con = new SqlConnection(connectionString))
{
    SqlCommand cmd = new SqlCommand();
    cmd.Connection = con;
    cmd.Parameters.Clear();
    cmd.CommandText = "getEmployeeList";
    cmd.Parameters.AddWithValue("@sort",
    pagination.data.columns[pagination.data.order[0].column].name == null ?
    "EmployeeId asc" : pagination.data.columns[pagination.data.order[0].column].name+" "+
        pagination.data.order[0].dir);
    cmd.Parameters.AddWithValue("@size", pagination.data.length);
    cmd.Parameters.AddWithValue("@page", pagination.data.start);
    cmd.Parameters.AddWithValue("@totalrow", pagination.data.length);
    // cmd.Parameters.AddWithValue("@P_Search", pagination.data.search.value);
    cmd.CommandType = System.Data.CommandType.StoredProcedure;
    sqlDataAdapter.SelectCommand = cmd;
    sqlDataAdapter.Fill(ds);

}
DTResponse.recordsTotal = ds.Tables[0].Rows.Count;
DTResponse.recordsFiltered = Convert.ToInt32(ds.Tables[1].Rows[0][0]);
DTResponse.data = JsonConvert.SerializeObject(ds.Tables[0]);
}
catch(Exception ex)
{

}
return Json(DTResponse, JsonRequestBehavior.AllowGet);
}

In View Side, add the Jquery Data Table References
<link href="https://cdn.datatables.net/1.12.1/css/jquery.dataTables.min.css" rel="stylesheet">
<script src="https://cdn.datatables.net/1.12.1/js/jquery.dataTables.min.js"></script>

cshtml Code
Here is the Ajax call for getting the Employees data with Server Side DataTable Properties
<h2>paginationExample</h2>
<script src="~/Scripts/jquery-3.4.1.js"></script>
<link href="https://cdn.datatables.net/1.12.1/css/jquery.dataTables.min.css" rel="stylesheet">
<script src="https://cdn.datatables.net/1.12.1/js/jquery.dataTables.min.js"></script>
<div id="tblUpdatePcInfo">

</div>
<script>
var table;
$(document).ready(function () {
GetAllEmployyesData();
})
function GetAllEmployyesData() {
var tablecontent = '<table id="tblPCInfo" class="table table-bordered table-striped display nowrap" style="width:100%"><thead><tr>\
<th>EmployeeID</th>\
<th><input type="checkbox" id="chkSelectAll" class="filled-in chk-col-success" title="Select All"/></th>\
<th class="LastName">LastName</th>\
<th>FirstName</th>\
<th>Title</th>\
<th>TitleOfCourtesy</th>\
<th>Address</th>\
<th>City</th>\
<th>PostalCode</th>\
<th>Country</th>\
<th>HomePhone</th>\
</tr></thead><tbody></tbody></table>';
$("#tblUpdatePcInfo").html(tablecontent);
table = $('#tblPCInfo').dataTable({
    clear: true,
    destroy: true,
    serverSide: true,
    pageLength: 50,
    lengthMenu: [[10, 25, 50, 100, 100000], [10, 25, 50, 100, "All"]],
    autoFill: false,
    "initComplete": function (settings, json) {
        $(this.api().table().container()).find('input').attr('autocomplete', 'off');
    },
    "ajax": {
        url: "/Home/GetEmployeeData",
        type: "POST",
        contentType: "application/json; charset=utf-8",
        data: function (d) {
            var data = { data: d };
            return JSON.stringify(data);
        },
        AutoWidth: false,
        "dataSrc": function (json) {
            var data = json;
            json.draw = data.draw;
            json.recordsTotal = data.recordsTotal;
            json.recordsFiltered = data.recordsFiltered;
            json.data = JSON.parse(data.data);
            return json.data;
        }
    },

    "columns": [
        {
            "data": "EmployeeID", "width": "10px", "orderable": false, "name": "EmployeeID"
        },
        {
            "data": "a", "width": "15px", "orderable": false, "name": "m.LicNo", "render": function (data, type, row, meta) {
                return '<div style="text-align:center;"><input type="checkbox" class="SelectedChk" id="' + row.LicNo + '" value="' + row.LicNo + '" class="filled-in chk-col-success" title="Select All"/></div>';
            },
            "searchable": false
        },
        {
            "data": "LastName", "name": "LastName", "searchable": false
        },
        { "data": "FirstName", "name": "FirstName", "searchable": false },
        { "data": "Title", "name": "Title", "searchable": false },
        { "data": "TitleOfCourtesy", "name": "TitleOfCourtesy", "searchable": false },
        { "data": "Address", "name": "Address", "searchable": false },
        { "data": "City", "name": "City", "searchable": false },
        {
            "data": "PostalCode", "name": "PostalCode", "searchable": false
        },
        { "data": "Country", "name": "Country", "searchable": false },
        { "data": "HomePhone", "name": "HomePhone", "searchable": false }
    ]
});
}
</script>

The Values of GetEmployeeData argument will be as follows

OUTPUT

In this article, we will discuss something new: pass data across views. We will also summarize some common or important shared features for various vew variables.

Brief Summary of ViewData
We will start our discussion from ViewData, but most or all features are the same for other MVC View Variables. The ASP.NET Core also has the same features. So, we will discuss ViewData in the most, and have the last part to see the extension to other View variables.

Type of ViewData
We have discussed ViewData, ViewBag, TempData, Session type features. They are all the Type of Dictionary:

Where the difference between ViewBag and ViewData:

Besides ViewBag, all other View Variables need to be cast before using. We define a ViewData named "book": as type BookModel with data such as Id = 1:

When we retrieve data, we have to cast the data back to the data type. Otherwise, we will get an error message:

After casting:

Pass Data into _Layout.cshtml Page by ViewData
The _layout.cshtml is a shared page by other specific views. It belongs to no Controller or Action, or we can say it belongs to every Controller or Action when the related view is using _layout.cshtml. Therefore, we can pass data into Layout either from the Controller or Action view, that uses the _layout.cshtml, such as, if we have a Contact Us Action:

Or, we can define the ViewData from the Contact Us View:

Both ways will pass the data into Layout page:

Notes
1, We usually introduce the Layout into View by the code in the View as below:

2, in some cases, if we want to make the Layout page(s) dynamic, we can assign the layout to the view through Controller/Action:

3, A related important shared concept for MVC, _Viewstat.cshtml

Pass Data into _Layout.cshtml Page by Other View Variables
The same is true for other MVC View Variables, such as ViewBag, TempData, and absolutely Session variable:

Pass TempData to Layout:

Pass ViewData to Layout:

Pass ViewBag to Layout:

This article discussed using ASP.NET MVC ViewData to pass data into Layout View through either Controller or View.  The features are available or the same as other View Variables in ASP.NET MVC, and the same is true for ASP.NET Core MVC.

Introduction 
Let's discuss filters in ASP.NET MVC.

 
What are the Filters?
Filters in ASP.NET MVC are a way to implement cross-cutting logic, (for example, security and logging). Sometimes, we need to execute logic before or after executing an action. For such a scenario, ASP.NET MVC provides us with Filters.
 
ASP.Net MVC provides us with some built-in Filters:

    Output Cache- This action filter caches the output of a controller action for a specified amount of time.
    Handle Error- This action filter handles errors raised when a controller action executes.
    Authorize- This action filter enables you to restrict access to a particular user or role.

Asp.net MVC Filters are used to inject extra logic at the different levels of MVC Framework request processing. Filters provide a way for cross-cutting concerns (logging, authorization, and caching).
 
In this article, I will show you the different categories of filters that the MVC Framework supports, how to control their execution, and how to create and use filters. We can create our own custom filters. In every request, your action method in the controller will have to check if the user was right or authorized to perform the action and view its result.
 
The ASP.NET MVC Framework supports four different types of filters. Authentication Filters are introduced with ASP.NET MVC 5. Each allows you to introduce logic at different points during the request processing
 

1. Authorization filters
The AuthorizeAttribute and RequireHttpsAttribute are examples of Authorization Filters. Authorization Filters are responsible for checking User Access; these implement the IAuthorizationFilterinterface in the framework. These filters used to implement authentication and authorization for controller actions. For example, the Authorize filter is an example of an Authorization filter.
 
2. Action Filters
The Action Filter is an attribute that you can apply to a controller action or an entire controller. This filter will be called before and after the action starts executing and after the action has executed.
 
Action filters implement the IActionFilter interface that has two methods OnActionExecuting andOnActionExecuted. OnActionExecuting runs before the Action and gives an opportunity to cancel the Action call. These filters contain logic that is executed before and after a controller action executes, you can use an action filter, for instance, to modify the view data that a controller action returns.
 
3. Result Filters
The OutputCacheAttribute class is an example of Result Filters. These implement the IResultFilter interface which like the IActionFilter has OnResultExecuting and OnResultExecuted. These filters contain logic that is executed before and after a view result is executed. Like if you want to modify a view result right before the view is rendered to the browser.
 
4. ExceptionFilters
 
The HandleErrorAttribute class is an example of ExceptionFilters. These implement the IExceptionFilter interface and they execute if there are any unhandled exceptions thrown during the execution pipeline. These filters can be used as an exception filter to handle errors raised by either your controller actions or controller action results.
 
Summary
In this article, we learned about the Type of filters in MVC Application and why they're important.
Thanks for reading

1) View Data

ViewData is a built-in object of the "ViewDataDictionary" class.
ViewData stores the data in key-value pairs

Example
public IActionResult Index() {
    ViewData["Name"] = "MVC";
    return View();
}

Output

2) View Bag
ViewBag is also used for sending Data from the controller to View.
ViewBag is developed based on Dynamic Typing.
No need to perform Type Casting
Use key as property

Example
public IActionResult ViewBagIndex() {
    ViewBag.Name = "MVC";
    return View();
}

Output

3) Temp Data
TempData is used to transfer the aata from one Action to Another Action at the time of redirection
TempData is an object of the "TempDataDictionary" class

Example
public ActionResult TempDataIndex() {
    TempData["Name"] = "MVC";
    return View();
}

Output

Please do leave a comment if you find it useful.

Many times we need to post a list of records to controller instead of a single record to controller such as dynamically added html table records etc . Also I have learned on many forum posts regarding the problem in posting a list of records to controller, as many are saying while posting list of records we are getting only one record at controller instead of list of records . So by considering this requirement I have decided to write this article . Now let's learn step by step which helps beginners to learn how to get list of records into ASP.NET MVC controller .
 
Scenario
Let's consider we have a requirement in which a single user can add multiple orders of products at a time instead of  ordering one by one. So in this scenario we need to create one single view from a complex model that is from multiple models where one model can be used to hold customer information and the second model used to hold the list of records .

So let's demonstrate the preceding scenario by creating one simple ASP.NET MVC application

Step 1: Create an MVC Application.
Now let us start with a step by step approach from the creation of a simple MVC application as in the following:

    "Start", then "All Programs" and select "Microsoft Visual Studio 2015".

    "File", then "New" and click "Project", then select "ASP.NET Web Application Template", then provide the Project a name as you wish and click OK. After clicking, the following window will appear:

Step 2: Create Model Class
Now let us create the model class file named OrderModel.cs by right clicking on model folder as in the following screenshot:

Note:
It is not mandatory that Model class should be in Models folder, it is just for better readability; you can create this class anywhere in the solution explorer. This can be done by creating different folder names or without folder name or in a separate class library.

OrderModel.cs class file code snippet:
    /// <summary>  
       /// To hold order details  
       /// </summary>  
      public class OrderModel  
       {  
           public string ProductCode { get; set; }  
           public string ProductName { get; set; }  
           public Int16 Qty { get; set; }  
           public double Price { get; set; }  
           public double TotalAmount { get; set; }  
       }  
      public class OrderDetail  
       {  
           /// <summary>  
           /// To hold list of orders  
           /// </summary>  
           public List<OrderModel> OrderDetails { get; set; }  
      
       }

 Step 3: Add Controller Class.
Now let us add the MVC 5 controller as in the following screenshot:

After clicking on Add button it will show the window. Specify the Controller name as Order with suffix Controller.

Note:
The controller name must be having suffix as 'Controller' after specifying the name of controller. Now modify the default code in OrderController.cs class file to bind HTML table in view from strongly typed model class with list of records and getting those list of records into controller, after modifying code will look like as follows,

OrderController.cs
      public class OrderController : Controller  
        {  
            /// <summary>  
            /// Get list of records with View     
            /// </summary>  
            /// <returns></returns>  
            public ActionResult PlaceOrder()  
            {  
                List<OrderModel> objOrder = new List<OrderModel>()  
                {  
     new OrderModel {ProductCode="AOO1",ProductName="Windows Mobile",Qty=1,Price=45550.00,TotalAmount=45550.00 },  
    new OrderModel {ProductCode="A002",ProductName="Laptop",Qty=1,Price=67000.00,TotalAmount=67000.00 },  
    new OrderModel {ProductCode="A003",ProductName="LCD Television",Qty=2,Price=15000.00,TotalAmount=30000.00 },  
    new OrderModel {ProductCode="A004",ProductName="CD Player",Qty=4,Price=10000.00,TotalAmount=40000.00 }  
                };  
      
                OrderDetail ObjOrderDetails = new OrderDetail();  
                ObjOrderDetails.OrderDetails = objOrder;  
                return View(ObjOrderDetails);  
            }  
            /// <summary>  
            /// Get list of records from view  
            /// </summary>  
            /// <param name="Order"></param>  
            /// <returns></returns>  
            [HttpPost]  
            public ActionResult PlaceOrder(OrderDetail Order)  
            {  
      
      
                return View();  
            }  
        }

Step 4:
Creating strongly typed view named PlaceOrder using OrderDetail class. Right click on View folder of created application and choose add view, select OrderDetail model class and scaffolding template List   as,

Click on Add button then it will create the view named PlaceOrder , Now open the PlaceOrder.cshtml view, Then some default code you will see which is generated by MVC scaffolding template, Now modify default code to make as per our requirements, After modifying the code it will look like the following,

PlaceOrder.cshtml
@model GetHTMLTableRecordsInMVC.Models.OrderDetail  
@{  
    ViewBag.Title = "www.cpmpilemode.com";  
}  
<hr />  
@using (Html.BeginForm())  
{  
    @Html.AntiForgeryToken()  
 
    <div class="form-horizontal">  
        <div class="form-group">  
            <div class="col-md-offset-2 col-md-10 text-right">  
                 <input type="button" value="Add Product" class="btn btn-primary" />  
            </div>  
        </div>  
        <div class="form-group">  
            <div class="col-md-12">  
                <table class="table table-condensed table-hover">  
                    <tr>  
                        <th>  
                            Product Code  
                        </th>  
                        <th>  
                            Product Name  
                        </th>  
                        <th>  
                            Quantity  
                        </th>  
                        <th>  
                            Price  
                        </th>  
                        <th>  
                            Total Amount  
                        </th>  
                    </tr>  
                    @{  
                        //To make unique Id  
                        int i = 0;  
                        foreach (var item in Model.OrderDetails.ToList())  
                        {  
 
                            <tr>  
                                <td>  
 
 
                                    @Html.EditorFor(o => o.OrderDetails[i].ProductCode, new { @id = "ItemCode_" + i })  
                                </td>  
                                <td>  
                                    @Html.EditorFor(o => o.OrderDetails[i].ProductName, new { @id = "ProductName_" + i })  
                                </td>  
                                <td>  
                                    @Html.EditorFor(o => o.OrderDetails[i].Qty, new { @id = "Qty_" + i })  
                                </td>  
                                <td>  
                                    @Html.EditorFor(o => o.OrderDetails[i].Price, new { @id = "Price_" + i })  
                                </td>  
                                <td>  
                                    @Html.EditorFor(o => o.OrderDetails[i].TotalAmount, new { @id = "Price_" + i })  
                                </td>  
 
                            </tr>  
                            i++;  
                        }  
                    }  
                </table>  
            </div>  
        </div>  
        <hr />  
        <div class="form-group">  
            <div class="col-md-offset-2 col-md-10 text-center">  
                <input type="submit" value="Place Order" class="btn btn-primary" />  
            </div>  
        </div>  
    </div>  
 }

Common issues
While binding list of records your control Id's must be unique , otherwise same first record will repeat in all lists. So to avoid this we need to maintain  unique id's for control . As we have maintained in preceding view manually by using incremental i counter and model properties .

Now after adding the Model, View and controller into our project. The solution explorer will look like as follows,

Now we have done all coding to upload files . Step 5 : Now run the application. After running the application initial screen will look like as follows,

In preceding table we are adding orders (records) dynamically. Put break point on PlaceOrder action result method and click on Place Order button. Now the reference variable Order of OrderDetail class will show the four records in debug mode as,

In the preceding image you can see that four records list count which is coming from view because we have added four records into the table . Now Expand the OrderDetails node it will show the following records,

I hope from all preceding examples we have learned how to pass dynamically added HTML table records list to controller in ASP.NET MVC.

Note:

    Download the Zip file of the sample application for a better understanding.
    Add product button is just for scenario purpose , In next article I will explain how to add dynamic records into html table .
    Since this is a demo, it might not be using proper standards, so improve it depending on your skills.

Summary

I hope this article is useful for all readers. If you have any suggestions please contact me.

View injection is the most useful feature introduced in ASP.NET Core. Using ASP.NET Core inbuilt dependency injection container, we can easily inject dependencies in Controllers, Filters, and Views. In this post, I am going to show how to inject dependencies using inject keyword in the View.

Previously, to retrieve the data in View, we needed to pass it from the Controller using Controller properties, like ViewBag, ViewData or model properties. In ASP.NET Core MVC, things are quite smooth by the usage of Inject directive. Inject helps with injecting the dependencies directly to the View and retrieving the data.

Setup project
In Visual Studio, create a new project (File > New > Project), and select ASP.NET Core Web Application (.NET Core).

Enter a name for the application and click OK. Select Web Application to generate the default ASP.NET Core MVC project.

Visual Studio will automatically generate ASP.NET Core MVC project structure and display a welcome screen.

Add Services
Add a new folder "Models" and add FruitServices class in it. Now, add a method GetFruits() which returns List<string>().

    public class FruitServices  
    {  
        public List<string> GetFruits()  
        {  
            return new List<string>() { "Mango", "Apple", "Apricot", "Banana", "Grapes" };  
        }  
    }  

Inject in View
We can inject a service into a View using the @inject directive. You can think of @inject as adding a property to your View, and populating the property using DI.
 
The basic syntax for View Injection is:
    @inject <service> <name>  

    @inject is the directive used to inject dependencies
    <service> is service class.
    <name> is the service injection name by which we can access service methods.

In our example, we are going to inject FruitServices and give service injection name fruitList.
    @inject MVCCoreExample.Models.FruitServices fruitList  
      
    <h3>Fruit List</h3>  
    <ul>  
        @foreach (var name in fruitList.GetFruits())  
        {  
            <li>@name</li>  
        }  
    </ul>  

This View displays a list of fruits which are populated from the injected FruitServices. Using GetFruit() method, we can retrieve a list of fruits.
 
Let's run it without registering FruitServices in DI container.

When we run the app, it will throw an invalid operation exception "No service for type 'MVCCoreExample.Modes.FruitServices' has been registered". This error occurred because we didn't register FruitServices in a dependency injection container.
 
Let's register it first and try again!
Register Service
Open startup.cs class and register service for dependency injection in ConfigureServices method. You can register your own application services, using AddTransient method. FruitServices will be instantiated by the container and used to fulfill such requests.

    public void ConfigureServices(IServiceCollection services)  
    {  
        // Add framework services.  
        services.AddMvc();  
        services.AddTransient<FruitServices>();  
    }  

Run it!
Here it is! The sample displays the data from the service injected in View.

Injecting dependencies directly into MVC View can make things a bit easier. In this post, I have shown a simple View Injection sample to understand the use of Inject directive. View injection can be useful for populating UI elements, like selection list, radio buttons etc. This will increase code re-usability and keep your Controller clean by minimizing the amount of code required on Controllers.