The solution is offline because its associated Team Foundation Server is offline.

这几天一直打开解决方案出现“The solution is offline because its associated Team Foundation Server is offline.”的错误。一直都是重新绑定解决方案，今天有空搜索了一上google，找到了解决方法：

Right click the solution project and select Go Online. It will check for any changes made and prompt you for them.

http://www.tech-archive.net/Archive/VisualStudio/microsoft.public.vstudio.general/2008-11/msg00089.html

在此作个记录。