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    <p>Have a look at the input names that are being generated within your HTML. I think you have an issue with the naming of your controls thus the default model binding is failing since you mentioned that the using <code>FormCollection</code> works correctly. I am making this assumption since I don't know what your Questions and Answers classes look like</p> <pre><code>&lt;%= Html.TextBoxFor(model =&gt; model.Answers[(int)question.QuestionID - 1].AnswerValue) %&gt; </code></pre> <p>Won't this render something similar to the following; which if I'm not mistaken will not bind to your model. The same applies for the <code>RadioButtons</code>.</p> <pre><code>&lt;input type="text" name="Answers[0].AnswerValue" id="Answers_0__AnswerValue" value="somevalues"/&gt; </code></pre> <p>The RadioButton helper should be</p> <pre><code>&lt;%= Html.RadioButton("Questions[" + question.QuestionID + "].ID", "Yes", false)%&gt; // you now get a list of questions &lt;input type="radio" name="Questions[1].ID" id="Questions_1__ID" value="No" checked="checked"/&gt; </code></pre> <p>There are some ways you can try to resolve this:</p> <ol> <li>Correctly name your input controls so that they match you ViewModel. (This includes posting back all the required fields for you model - I think that that default values are used when the model binding occurs if its not posted)</li> <li>Create a custom model binder</li> <li>You may need to tell the Binder what the Prefix of the input fields are. (<a href="http://msdn.microsoft.com/en-us/library/system.web.mvc.bindattribute_members.aspx" rel="nofollow noreferrer"><code>[Bind]</code> attribute</a>) to specifically include or exclude form fields.</li> <li>Create a new Model containing the values you expect to post back</li> </ol> <p>I think that overall that your approach needs to slightly change. From the info provided, your Q&amp;As are closely related. Depending on the question type your 'answer' is either boolean or freetext. At the moment your are not posting a <code>List&lt;Questions&gt;</code> back to the server. Answers, yes, but they are not I don't think that it is recognised as <code>List&lt;Answers&gt;</code>. </p> <p><a href="http://haacked.com/archive/2008/10/23/model-binding-to-a-list.aspx" rel="nofollow noreferrer">Haacked</a> has a post which I think is related to your issue and <a href="https://stackoverflow.com/questions/2293025/asp-net-mvc-2-0-ilistt-checkboxes">this SO question</a> further indicates that it may still applly to ASP-MVC-2.</p>
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    1. POHow to pass strongly typed results back to ActionResult?
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    1. POHow to pass strongly typed results back to ActionResult?
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    1. COI think you might be on to something Ahmad, but isn't Answers[0].AnswerValue valid? (It's what I am looking to bind to since Answers is simply a list). I have a list of Questions and a list of Answers in my ViewModel, how should I name my input controls to match the ViewModel? I'll gladly rename if necessary.
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      1. USMark Kadlec
    2. COThe issue is a dual one 1) the form fields need to be sequentially indexed to bind correctly and 2) its failing to create the SmartFormViewModel since its failing to decide what the Type of the Model is (since it is Complex). I suggest that you actually Create a new ViewModel for the Post back to the `Next` method with the fields that you actually require.
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    3. COI think you are right Ahmad, I will try. It makes me wonder why it is failing to decide, the object names are named pretty accurately (Answers[3].AnswerValue seems pretty specific!). I definitely think that is it though, I will try your suggestion.
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