The dropdown list actual data is not selected when I open my dialog box.

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C#

MVC

DropDownList

When I open my diaglog box, the dropdown list of the actual data in table is not selected. It selected the first one of data in dropdown list. Please help me.

What I have tried:

In Dialog view,

<div style="margin: 0 10px 10px 10px">
       <span style="color: #ff6a00">Menu Style</span>
       <span> @Html.DropDownListFor(modelItem => item.MenuStyle, (IEnumerable<selectlistitem>)ViewBag.MenuStyle, new { @class = "form-control", @id = ddlStyle, rows = "2", @style = "width:100%", Selected = true })</span>
  </div>

In Controller,

public PartialViewResult _ShowAllMenu(int restID)
 { 
   ViewBag.MenuCategory = productRepo.MenuCategory.Where(p => p.Category == "C").Select(p => new SelectListItem { Text = p.Name, Value = p.Name });
  }