title: Dropdownlist issue in razor
body: <p>hi all i have a controller</p>
  
  <pre><code>  public ActionResult Search(FormCollection collection)
      {
          ....
          var column = new Models.ColumnMapping("CTR");
          ViewData["ColoumName"] = column;
          var search = new Models.Search(columnname,searchvalue);
  
          return View(search);
      }
  </code></pre>
  
  <p>my view data contains following model property value..</p>
  
  <pre><code>public class Column {
      public string ColumnName { get; set; }
      public DataTypes DataType { get; set; }
     }
  </code></pre>
  
  <p>i have to create a drop down list for ColumnName(all data contain in VIewData) and my view is like </p>
  
  <pre><code>     @Html.DropDownListFor("clname", ViewData["ColoumName"] as IEnumerable&lt;AML.Web.Models.Column&gt;, "ColumnName", "ColumnName"))
  </code></pre>
  
  <p>but this is not working</p>