DropDownList problems-There is no ViewData item of type 'IEnumerable<SelectListItem>' that has the key 'AppId'.

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C#

MVC

C#3.5

Razor

Hello,
I am populating a dropdown values in the master page using partial view .It was working properly in the local syatem ,After publishing the same cade in the IIS i am getting Error

There is no ViewData item of type 'IEnumerable<SelectListItem>' that has the key 'AppId'.

I am sharing the code

[ChildActionOnly]
       public ActionResult ApplicationDDL()
       {
           try
           {
               var apps = new ApplicationDDL();
               List<Application> lstApps = new List<Application>();
               lstApps = (List<Application>)Session["Applications"];
               if (lstApps.Count > 0)
               {
                   var items = new List<SelectListItem>();
                   foreach (var item in lstApps)
                   {
                       var selectedItem = false;
                       if (item.Id == Convert.ToInt32(Session["AppId"].ToString()))
                       {
                           selectedItem = true;
                       }
                       items.Add(new SelectListItem { Text = item.Name, Value = item.Id.ToString(), Selected = selectedItem });
                   }
                   apps.Applications = items;
               }
               return PartialView("~/Views/Shared/ApplicationDropDown.cshtml", apps);
           }
           catch (Exception ex)
           {
               throw ex;
           }
       }

public class ApplicationDDL
 {
     public int AppId { get; set; }
     public List<SelectListItem> Applications { get; set; }
 }

Partial View

@model UMS.MVC.Controllers.ApplicationDDL
<div id="applicationDropdown">
    <div style="float: left; margin-left: 3px; color: white; padding-top: 6px;">
        @Html.Label("Application : ")
    </div>
    <div style="float: left; margin-left: 8px; padding-bottom: 6px; padding-top: 6px;">
        @Html.DropDownListFor(m => m.AppId, Model.Applications, new { @class = "appDDL", @id = "appDDL"})
</div> 

calling this dropdown in the layout page

@Html.Action("ApplicationDDL")

Please let me know what are the changes has to be made to make this work.
Thanks in advance