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copied!<p>I found some insight here: <a href="http://forums.asp.net/p/1396019/3006051.aspx" rel="nofollow noreferrer">http://forums.asp.net/p/1396019/3006051.aspx</a></p> <blockquote> <p>If you don't want to use Builtin Model Binding, then to use Bultin Validation (SanjaySutar want to use), for every ModelError you add, you will need to add a ModelValue: ModelState.AddModelError("Name", "Bad Name");</p> <p>ModelState.SetModelValue("Name", ValueProvider["Name"]);</p> </blockquote> <p>So I updated my code like so:</p> <pre><code>ModelState.SetModelValue("Description", new ValueProviderResult(ValueProvider["Description"].AttemptedValue, collection["Description"], System.Globalization.CultureInfo.CurrentCulture)); ModelState.SetModelValue("EventName", new ValueProviderResult(ValueProvider["EventName"].AttemptedValue, collection["EventName"], System.Globalization.CultureInfo.CurrentCulture)); ModelState.SetModelValue("EndDate", new ValueProviderResult(ValueProvider["EndDate"].AttemptedValue, collection["EndDate"], System.Globalization.CultureInfo.CurrentCulture)); ModelState.SetModelValue("StartDate", new ValueProviderResult(ValueProvider["StartDate"].AttemptedValue, collection["StartDate"], System.Globalization.CultureInfo.CurrentCulture)); ModelState.SetModelValue("TrackId", new ValueProviderResult(ValueProvider["TrackId"].AttemptedValue, collection["TrackId"], System.Globalization.CultureInfo.CurrentCulture)); ModelState.SetModelValue("WebContent", new ValueProviderResult(ValueProvider["WebContent"].AttemptedValue, collection["WebContent"], System.Globalization.CultureInfo.CurrentCulture)); </code></pre> <p>The reason I am doing this is because I wanted to a. have all (or as much as possible) validation done in my Business Object, including required fields, and b. I wanted my own messages in the validation summary (e.g. "FieldX is a required field." instead of "A value is required."). If there's a better way to do this, please see my other question: <a href="https://stackoverflow.com/questions/646270/asp-net-mvc-custom-validation-message-for-value-types">ASP.NET MVC - Custom validation message for value types</a></p>

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