My ToolBox Show Multiple Copies Of The Same Control (VS2008)

Answer 1

You probably have your toolbox items in the on-disk cache or settings.

1. Close Visual Studio
2. Ensure no instances of devenv is running.
3. Go to Users\\AppData\Local\Microsoft and look for Visual Studio temp files.
4. Delete the temp files.
5. Go to Users\\Documents\VisualStudio 2008\Settings and make backups of your settings files, then delete the originals.
6. Reopen VS.NET, you should be prompted to choose your developer settings.