On POST , if validation failed and before sending back the ViewModel to the same View with Model State errors, do you rebuild ViewModel for all SelectLists, ReadOnly fields etc?
right now I have separate methods for Fill First Time(for GET Edit-Method) / Rebuild ViewModels from domain objects, what is the best practice so I can be DRY and also not have to change two methods any time I add a new readonly property to ViewModel?

**My Solution: Followed this Pattern**

Followed pattern suggested here: <https://stackoverflow.com/a/2775656/57132>
In IModelBuilder Implementation

```
Build(..)
{  
   var viewModel = new ViewModel();     
   // and Fill all Non-ReadOnly fields
   ...
   ...
   call CompleteViewModel(viewModel)     
}  

CompleteViewModel(ViewModel viewModel)
{
  //Fill all ReadOnly & SelectLists
  ...
}

```

The reason I went with this solution is because I don't want to store stuff on server to retrieve across the HTTP Requests