title: Remove connection from all groups in SignalR
body: <p>How can I remove a specific connection from all groups in SignalR? - In my application the connection of a specific user can be associated with several groups. I don't want to use a database to track the association of the connection to groups.</p>
  
  <p><a href="http://www.asp.net/signalr/overview/hubs-api/hubs-api-guide-server#grouppersistence" rel="noreferrer">SignalIR docs</a></p>