How to fix “namespace x already contains a definition for x” error? Happened after converting to VS2010

Question

Specifically the error occurs in the Resources.Designer.cs:

Error 2 The namespace \'ModulusFE\' already contains a definition for \'Sto

Answer 1

If you copy&paste your pages don't forget to rename class names. Otherwise you get this error also with "Type already defines a member called 'OnGet' with the same parameter types"