Default value is not being set in my SelectList in MVC4 View

I have a View that displays a dropdown using the following in my view:

@Html.DropDownListFor(model => model.databaseServerTypeID, (SelectList)@ViewBag.databaseServerTypeID, "-- Choose Server Type --")

Select allOpen in new window

My Controller has the following code:

BusinessLogic bl = new BusinessLogic();
SelectList slServerType = bl.CreateServerTypeSelectList(_repository, appcatalog_database.databaseServerTypeID);
ViewBag.databaseServerTypeID = slServerType;
return View(appcatalog_database);

Select allOpen in new window

The CreateServerTypeSelectList is defined as follows:

        public SelectList CreateServerTypeSelectList(IAppCatalogContainerRepository repository, int defaultServerType)
        {
            IEnumerable<AppCatalog_ServerType> db;
            db = repository.GetAllServerTypes();           

            SelectList sl;
            if (defaultServerType == 0)
                sl = new SelectList(db, "servertypeID", "servertypeName");
            else
                sl = new SelectList(db, "servertypeID", "servertypeName", defaultServerType);
            
            return sl;
        }

Select allOpen in new window

I verified after the list is created that the SelectedValue is 2 which is the same value as the databaseServerTypeID in my model.  (see attached picture)

My view has the following code for displaying the dropdown:

        <div class="editor-field">
            @Html.Label("Server Type", new { @class = "editor-label" }) :
            @Html.DropDownListFor(model => model.databaseServerTypeID, (SelectList)@ViewBag.databaseServerTypeID, "-- Choose Server Type --")
            <span class="error-msg">@Html.ValidationMessageFor(model => model.databaseServerTypeID)</span>
        </div>

Select allOpen in new window

I verified that the list in the ViewBag still has the SelectedValue set to 2 and it does (see attached picture).

I've reviewed other posts and it seems like I am doing everything correctly but I can't get the default value to be selected.  Any help is greatly appreciated!
CreateServerTypeSelectList.fw.png
CreateServerTypeSelectListinView.png