In Visual Studio I keep getting two copies of FormMain.cs and one contains old edits, why?

In Visual Studio 2008 I keep getting two copies of my FormMain.cs file, one contains old edits, I've reb开发者_运维问答uilt the project and the solution but this doesn't fix it, what is the problem?

Thanks

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Check the file attributes (right-click and select Properties in windows explorer)

Make sure you're not having the Read-only flag set.

alt text http://chakrit.net/files/stackoverflow/readonly.png

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You may also check the localization property. Maybe you added an unwanted localized clone of this form.