Manually Set ModelState.isValid from Controller

Question

Is there a way for me to manually set the ModelState.isValid = False from the controller?

I have some code like this

    Dim _region As          


        

Answer 1

You can't set ModelState.IsValid directly, as it's a derived property that simply checks the models error collection. You can however add your own model errors, e.g:

ModelState.AddModelError("Region", "Region is mandatory");

ModelState.IsValid will then return false.