If you are using Visual Studio 2005, you will find it doesn't connect to Team Foundation Server like Visual Studio 2010 does. Actually, Visual Studio 2005 itself doesn't support integration with Team Foundation Server. To enable the integration, Microsoft has developed an update called "Visual Studio Team System 2005 Team Explorer" for Visual Studio 2005 users. For more info, please click here.
You can follow the below steps to integrate VS 2005 with TFS:
1. Download and install Visual Studio Team System 2005 Team Explorer.
2. You'll need to reapply Visual Studio 2005 Service Pack 1.
3. Install the Visual Studio Team System 2005 Service Pack 1 Forward Compatibility Update for Team Foundation Server 2010 (Installer).