Ever opened your aspx or ascx in Visual Studio 2010 only to see this: When this happens: Editing in design view is virtually impossible
Can't add new controls
Existing controls can't be edited in design view
The solution that's worked for me is to: Close VS 2010
Delete all temporary files created by VS 2010. In addition to the usual suspects, make sure you delete the folder that corresponds to your website in this location: C:\Users\[username]\AppData\Local\Microsoft\WebsiteCache
Restart VS 2010
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