c# - InvalidCastException when not casting -


I am using the winforms Webbrowser control to load a webpage, and for this Waiting for the page to load. So I have a time loop that checks the ReadyState property, but it's a InvalidCastException Throwing

I do not understand why I see this error because I am not casting anybody And casting is not necessary because these variables like the value of the same type.

Anyone put some light on this?

Code below: 

  while (wb.ReadyState! = WebBrowserReadyState.Complete) {Thread. Sleep (2500); }   
 Edit:  
 Screenshot of Exceptions window    
 
 
 Why do not you just subscribe to an event instead of using a loop?  
  Private zeros wb_DocumentCompleted (Object Sender, EventArgs E) {// stuff after loading page}

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