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ViewModel in post action is null

Posted By:      Posted Date: April 10, 2011    Points: 0   Category :ASP.Net
I'm having a problem that my ViewModel in a Create Action Post is not filled. It is always null...
I've used ViewModels already for viewing pages but not for a create action.
Say I have the following ViewModel:
public class TrouserCreateViewModel
        public Trouser Trouser { get; set; }
        public int Hallo { get; set; }
The Trouser object has the properties Name, Size and Length and is an entity in my EF4.0.
If I create a view with only a textbox for the integer Hallo everything works fine. In the post I get the TrouserCreateViewModel back and the int Hallo property is filled with the number that is filled in the textbox.
But if I create another textbox:
@Html.EditorFor(model => model.Trouser.Name)
The ViewModel is posted but the properties in the ViewModel are null. Even the Hello property is null then.
If I use the code:
[Bind(Prefix = "Trouser")]Trouser resource
then the Name property is filled. I don't know what the Bind does and why this works but can somebody explain why my regular properties for my ViewModel are null???
public ActionResult Create(TrouserCreateViewModel 

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