= !InvalidOperationException =

This exception is thrown by some library methods when the operation in question is not valid. Since there are already more specific ArgumentNullException and ArgumentException classes, InvalidOperationException will often indicate that the state of the object against which the method is called is not valid.

== See also ==

 * http://msdn.microsoft.com/en-us/library/system.invalidoperationexception.aspx
 * LibraryTopics