Pay some attention to reconnecting TFS

Description:  My TFS(Team Foundation Server) is connecting to source code server, however, the code in server can NOT be checked-out (so you can NOT see the red “checkmark”) when I try to edit and do some changes.

Cause: The state of the code in your client is offline when TFS misses connection to server.

Solution: Just set the state of the code in your client to online.