This is not a valid location for a breakpoint

Question

I am trying to put a breakpoint on below mentioned page in my ASP.Net MVC 2 application\'s .ascx or .aspx files in Visual Studio 2010. But it won\'t let me, it shows:

Answer 1

This is a bug in Visual Studio 2013. It should be fixed in update 2 (or higher).
That said, updating only temporarily solved the problem for myself.