VS2010 “An item with the same key has already been added”

Question

I recently installed Visual Studio 2010 and copied and converted an old VS2005 solution to VS2010

When I edit this solution, if I try to change a control\'s .image p

Answer 1

I had the same experience but due to duplicate image resources in the .csproj file:

Probably from a Merge Gone Wild(tm).

Same symptoms--regular build OK, rebuild fails. Remove the duplicate resource entries to fix the problem.