mvc 3 update model

I have a view that displays several checkbox lists of items in tables (the lists are dynamic). I need to know how to update the ViewModel when the user clicks on a checkbox so that when control returns to the controller it can inspect the viewmodel to determine which items were sele开发者_开发问答cted.

The VM contains several properties such as

public IEnumerable<IFilterItem> Cities;

public Interface IFilterItem
{
   int ID { get; set; }
   string Name { get; set; }
   bool IsSelected { get; set; }
}

What I need help with is how to set the view's copy of the model data in the checkbox's onclick handler. Thanks as always, you guys are great!

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Are you using the CheckBoxFor helper? If so, when control returns to the controller your view model should just have IsSelected set based on the state of the checkbox.