为了避免对版本库的影响，可以自己离线的修改代码，就要脱离TFS的管理，上网找到的解决方案：
找到*.sln文件用文本打开，可以找到：
Global
GlobalSection(SolutionConfigurationPlatforms) = preSolution
Debug|.NET = Debug|.NET
Debug|Any CPU = Debug|Any CPU
Debug|Mixed Platforms = Debug|Mixed Platforms
DebugLocal|.NET = DebugLocal|.NET
DebugLocal|Any CPU = DebugLocal|Any CPU
DebugLocal|Mixed Platforms = DebugLocal|Mixed Platforms
Production|.NET = Production|.NET
Production|Any CPU = Production|Any CPU
Production|Mixed Platforms = Production|Mixed Platforms
Release|.NET = Release|.NET
Release|Any CPU = Release|Any CPU
Release|Mixed Platforms = Release|Mixed Platforms
……
EndGlobalSection
EndGlobal
将所有这些内容删除，然后修改解决方案的名称，保存，重新打开就可以离线操作了
How to permanently remove TFS Source Control association bindings?
I have faced this issue when I decided to move one of my freelance project from my own TFS to CodePlex.
To re-assign to a new Source Control, you need to remove association to old one first.
Another case when you may need this is when you renamed your TFS and your projects cannot find their code storage and you will see this warning each time you try to open these projects:
Here is how to remove this association:
1. Remove all *.vssscc and *.vspscc files from your Solution folders.
2. Check if your Solution *.sln file is Read-Only. Remove this flag if needed.
3. Open *.sln file in an editor. I prefer Windows Notepad for such operations.
4. Find GlobalSection(TeamFoundationVersionControl) looking as showing below and remove it begining with GlobalSection and ending with EndGlobalSection:
GlobalSection(TeamFoundationVersionControl) = preSolution
SccNumberOfProjects = 2
SccEnterpriseProvider = {4CA58AB2-18FA-4F8D-95D4-32DDF27D184C}
SccTeamFoundationServer = http://<YourTFS>/tfs/defaultcollection
SccLocalPath0 = .
SccProjectUniqueName1 = <Your Project path and name in TFS>.csproj
SccProjectName1 = <Project Name>
SccLocalPath1 = <Project Path>
EndGlobalSection
5. Save and close your Solution file.
6. Go ahead and open this Solution in Visual Studio IDE as usual.
7. If you will get IDE warning similar as shown below, just select "Permanently remove source control association bindings".
That's it! Now you can associate your code with a new TFS Project.
P.S. I tested this on VS/TFS 2010. Not sure if this works with older versions.