Lamda Binding (Html.DropDownListFor)

Study The Query String ?categorySI=
// The POCO for the Form is stored here, see the <aside>
@model montegodata.ModelsView.WorkFlowTestViewModel

// Post the Form to the [ Category ] Controller using the [ SelectForm ] HtmlHelper
@using (Html.BeginForm("SelectForm", "Category", FormMethod.Post))
// POCO Field Column From The Model
@Html.TextBoxFor(m => m.Developer)

// Sample Usage
@Html.DropDownListFor(m => m.categorySI, 
                      new SelectList(Model.categories, "CategoryID", "CategoryName"))
Below is an alternative method using SelectListItem from System.Web.Mvc DropDownListFor has good cohesion with SelectListItem.
using System.Web.Mvc;
public List< /*System.Web.Mvc.*/SelectListItem > categories;

SubmissionModelView.categories = new List</*System.Web.Mvc.*/SelectListItem>();
SubmissionModelView.categories.Add(new SelectListItem {Text="Beverages", Value="1"});

@Html.DropDownListFor(m => m.categorySI, Model.categories)