Unable to cast object of type 'X' to type 'X' - ASP.NET

Question

I am currently working with a ASP.NET Web site project in Visual Studio 2008 and everytime I make a change to code behind page for a user control and browse to page that is

Answer 1

This blog posting describes the issue well:

http://professionalaspnet.com/archive/2007/04/09/Unable-to-cast-object-of-type-_2700_ASP.masterpage_5F00_master_2700_-to-type-_2700_ASP.masterpage_5F00_master_27002E00_.aspx