Drag and drop from Windows Explorer to Visual Studio isnt working on 64 bit Windows 711/24/2010
I attempted to add files to my web applications by using drag-and-drop from Windows Explorer to Visual Studio 2010 running on 64-bit Windows 7 numerous times in the past, but it never worked for me. I was stunned to see how easily other developers drag files into their solutions and Visual Studio automatically adds them to the projects. I always run my Visual Studio as Administrator to be able to debug the applications and configure IIS7 from within Visual Studio. Apparently this was the cause of the problem. Windows 7 has built-in security preventing drag and drop events from firing if the security permissions of the drag source don't match those of the drag target.
Solution: In order to enable drag-and-drop functionality in Visual Studio you should either run Windows Explorer as Administrator or run Visual Studio using default security context.