title: Page refresh in MVC
body: <p>I'm studing Microsoft ASP MVC framework. Here is a problem I encounterd:
  I have a view with DropDownList containning a list of countries and another DropDownList for states. The OnChange event post the form back and then the controller sends data to the states drop down which should update. But the second DropDownList doesn't change. They stay as what it was before the refresh. What should I do to fix this.</p>
  
  <p>Thanks in advance!</p>
  
  <p>Edit: Call ModelState.Clear() in the second controller fix that problem. Thanks for all of you who offers suggestions! Really Thanks!</p>