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

Posted on 2014-04-04
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Last Modified: 2014-04-14
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 --")

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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);

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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;
        }

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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>

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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
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Question by:dyarosh
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Expert Comment

by:Bob Learned
Comment Utility
I am not sure what the problem is, but I am not a big fan of the ViewBag as a viable way to pass stuff to the view.

I prefer the strong-typed ViewModel over the dynamic ViewBag.  

Here is an article that talks about the ViewModel:

Part 3: Views and ViewModels
http://www.asp.net/mvc/tutorials/mvc-music-store/mvc-music-store-part-3
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Accepted Solution

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dyarosh earned 0 total points
Comment Utility
I finally found the problem.  The variable that I used in the ViewBag was the same name as the field in my model.  When I changed the ViewBag variable to ViewBag.ServerTypeList, the default value is getting set.  There must have been some confusion with the names being the same.
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Author Closing Comment

by:dyarosh
Comment Utility
I had not received any help from the Experts in a while so I kept trying different things until I finally got it to work.
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