I installed ArcGIS 10.0 and .netSDK for it with integration with VS 2010. Then I created a button Add-In for ArcMap (.net 3.5). I can install Add-in, I can see the button in ArcMap but when I click the button there was nothing. I set the breakpoint in my project in the button's constructor but It this code is never called. I tried to perform the same steps with other projects types and even using VS 2008. But it didn't help.
PS In the output in the VS the last message is "A first chance exception of type 'System.TypeLoadException' occurred in mscorlib"
PS In the output in the VS the last message is "A first chance exception of type 'System.TypeLoadException' occurred in mscorlib"