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i was doing a web app and it was doing fine until i backup my project and formatted ma PC, re install visual studio 2012. now when i switch to source code it works fine but when i switch design view i get a bunch of error on the place holders.
Error creating control - (Content)
cannot find type system.componentmodel.toolboxitemfilterattribute in module system.dll
but the app works fine when running , i just cant edit in designer view
I recently found out a similar error and the solution there works great.
All I had to do was delete all files in the bin directory of my project and reopen the project.. lol