title: What is the ModelState class in MVC 3?
body: <p>I am learning MVC, and in ASP.Net MVC 3, what is the <a href="http://msdn.microsoft.com/en-us/library/system.web.mvc.modelstate%28v=vs.98%29.aspx">ModelState</a> class ? I have looked on Google and MSDN, but I can't seem to get a clear understanding of it's purpose. Can anyone help?</p>