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copied!<p>When the data is posted, the items listed in the <code>DropDown</code> are not posted back to the model so I am assuming you are not fetching them again and re-adding them to your model before returning your model back to the view.</p> <p>You need to make sure on your post that you are filling <code>Model.StateProvinces</code> and then passing it to your View. Only the values are persisted unlike WebForms which would maintain the <code>DropDownList</code> items in the <code>ViewState</code> and rebuild them for you.</p> <p>So assuming your controller looks something like:</p> <pre><code>// POST: /YourController/YourAction/{ID} [HttpPost] public ActionResult YourAction(YourModel model, int id) { // model.StateProvinceId has the selected value // you need to fill StateProvinces since it is empty as the list is not posted // back so it is not autofilled into your model. model.StateProvinces = LoadYourStateProvincesList(); // This would blow up if StateProvinces is null because your View is assuming that // it has a valid list of StateProvinces in it to build the DropDown return View(model); } </code></pre> <p>I actually asked a question a while back that might be of some use to help explain how to handle DropDown lists:</p> <p><a href="https://stackoverflow.com/questions/2398296/best-way-of-implementing-dropdownlist-in-asp-net-mvc-2">Best way of implementing DropDownList in ASP.NET MVC 2?</a></p> <p><strong>EDIT:</strong> Based on your comment it you are not even getting the first list up... well it looks like you might not have your model setup correctly. Do you even have a model? Your create is just returning <code>View()</code> with no model data in it. You need to create a Model and return it.</p> <p>Eg.</p> <pre><code>public class YourModel { public int StateProvinceId { get; set; } /// ... whatever else you need } // Then in your view your controller you need to set it and create it View(new YourModel() { StateProvinceId = 123 };); </code></pre> <p>You need the model so that when the form IS posted back you can retrieve the value because MVC will stuff the value into your model like th example I posted above regarding the POST part.</p> <p><strong>EDIT:</strong> Ok now that question is clearer and a lot simpler than the original question was making the problem out to be. The problem is your SelectList needs tell it which fields to put where:</p> <pre><code>SelectList theList = new SelectList(stateProvinces, "Value", "Text"); </code></pre> <p>In your original question you had:</p> <pre><code><%: Html.DropDownListFor(model => model.StateProvinceId, new SelectList(Model.StateProvinces, "StateProvinceId", "Name") )%> </code></pre> <p>Which was totally correct but it was how you were building up Model.StateProvinces that was wrong so it threw me off thinking it had to be something else. </p>

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