With this short tutorial, I will tell you how to create dynamic DropDownList with ASP.NET MVC 6. First thing you should do is make 2 DB Tables. And here is the example:

1.Designstions
Columns: DesignationID(PK,FK,numeric(6,0),not null)
             Designation (Varchar(50),null)
2.Persons
Columns: PersonID(PK,numeric(6,0),not null)
                 DesignationID(FK,numeric(6,0),not null)

Create The Models:
Designation.cs
{
   public decimal DesignationID { get; set; }
    public string Designation { get; set; }
}

Person.cs
{
    public decimal PersonID{ get; set; }
     [DisplayName("Designation")]
   public decimal DesignationID{ get; set; }
    public virtual  Designation designation { get; set; }
}

PersonController.cs
{
  public class PersonController: Controller
{
     public ActionResult Index()
        {
            var  mamun= db.Persons.Include(t => t.designation );
            return View(mamun.ToList());
        }
 public ActionResult Create()
        {
          ViewBag.DesignstionID= new SelectList(db.Designstions, "DesignstionID", "Designstion");
            return View();
        }
  public ActionResult Edit(decimal id)
        {
            if (id == null)
            {
                return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
            }
            Person person = db.Persons.Find(id);
            if (tblsalesperson == null)
            {
                return HttpNotFound();
            }
         ViewBag.DesignstionID= new SelectList(db.Designstions, "DesignstionID", "Designstion",person.DesignstionID);
                   return View(person);
        }
}
}

Next step, create.cshtml & Edit.cshtml:
<div class="form-group">
                @Html.Label("Designation", new { @class = "control-label col-md-2" })
                <div class="col-md-10">
                    @Html.DropDownList("DesignstionID")
                    @Html.ValidationMessageFor(model => model.DesignstionID)
                </div>
            </div>

I am using this following code to Add CSS class  'dropdownList' :
@Html.DropDownList("DesignstionID", (IEnumerable<SelectListItem>)ViewBag.DesignstionID, new { @class = "dropdownList" })  Instead Of that.

Index:  
@foreach (var item in Model)
{
    <td>
                    @Html.DisplayFor(modelItem => item.Designation.Designation)     
  </td>
}

HostForLIFE.eu ASP.NET MVC 6 Hosting
HostForLIFE.eu is European Windows Hosting Provider which focuses on Windows Platform only. We deliver on-demand hosting solutions including Shared hosting, Reseller Hosting, Cloud Hosting, Dedicated Servers, and IT as a Service for companies of all sizes. We have customers from around the globe, spread across every continent. We serve the hosting needs of the business and professional, government and nonprofit, entertainment and personal use market segments.