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    <p>I got the same Exception when I was experimenting with various Data binding techniques in MVC 2.0. My action method:<BR/></p> <pre><code>[AcceptVerbs(HttpVerbs.Post)] public ActionResult FindPersonList(FormCollection form) { PersonList personList = new PersonList(); if (TryUpdateModel(personList, form.ToValueProvider())) { //....Do something } else { Add Error message return View("SubmittedView"); } return View("GoNextView"); } </code></pre> <p><BR/> The view Contains only simple strigs and they are not NULL.</p> <p>The Exception:<br/></p> <pre><code>System.ArgumentException was unhandled by user code Message="Value cannot be null or empty. Parameter name: name" Source="System.Web.Mvc" ParamName="name" StackTrace:..... </code></pre> <p>I followed the suggestion from this link:<br/> <a href="https://stackoverflow.com/questions/1936970/asp-net-mvc-2-problem-with-updatemodel">ASP.NET MVC 2 problem with UpdateModel</a></p> <p>I downloaded Mvc source code and debugged it. I found out that the controllerContext is NULL which causes the above Exception. Why controllerContext is Null I don't know!</p> <p>I tried to set controllerContext during Unit test using Mock object and it worked fine.</p> <pre><code>[Test] public void FindPersonListActionTest() { using (new SessionScope())//Related to ActiveRecord from Castle project ORM { FormCollection form = new FormCollection(); form.Add("BaseSearchKey", "Thabet"); form.Add("DepSearchKey", "Yourtan"); form.Add("name", "Some name"); controller.ControllerContext = new FakeControllerContext(controller); Assert.IsNotNull(controller.HttpContext, "HttpContext is NULL"); Assert.IsNotNull(controller.ControllerContext, "ControllerContext is NULL"); var result = controller.FindPersonList(form) as ViewResult; Assert.IsNotNull(result, "ViewResult is NULL"); var list = (PersonList)((ViewResult)result).ViewData.Model; Assert.IsNotNull(list, "Controller Model is NULL"); } } </code></pre> <p>The same Exception happens when using UpdateModel:<br/></p> <pre><code>UpdateModel(personList, form); </code></pre> <p><BR/> I think it is a bug, because I tried default binding using action that takes a model as an arg, and behaves normally: <BR/></p> <pre><code>public ActionResult FindPersonList(PersonList personList){....} </code></pre> <p><BR/> And it works fine.</p> <p>However I would like very much to understand what was set controllerContext to Null.</p>
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