Today I faced an Issue with Visual Studio 2010 with regard to Intellisense.
As soon as I typed the dot operator, the Visual Studio Intellisense does not come up and I had to press ctrl + space bar to bring it up. To resolve this I tried the below option.
1. Make sure no devenv.exe is running.
2. Try running from Start->Run:
devenv /resetuserdata (This causes a new devenv process run to do the resetting job)
3. Open task manager and check that the devenv process finishes (this takes a couple of minutes)
Reference: http://social.msdn.microsoft.com/Forums/en/csharpide/thread/5ae00716-d9e5-4667-ae16-80f69e7c9556
