I opened a solution in offline mode. But now I am trying to go online and connect to tfs but I cannot seem to see the \"Go Online\" Button under File-> Source Control.
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This is not ideal, but another option is to close Visual Studio and open it again.
In my case whenever I get disconnected (we use TFS online) then after a drop in connectivity my VS thinks it is still offline, I cant convince it otherwise so when I restart VS it then forces it to check connectivity and then my solution is automatically back "online".