2.0 application to 4.0 .Net application

I had to convert an application to .Net 4.0 last night.  Did the usual things like:

• ·         changed the target framework in the project properties
• ·         changed the application pool to use 4.0

Still didn’t work

Anyway found an article that said i had to change the staticfile in Handler Mappings in IIS.

• ·         I selected this then on the right nav clicked “Revert to parent”

After this everything worked like a charm