SignalR - how to detect disconnected clients

How to detect which clients wa开发者_Go百科s disconnected? I'm using Hub and saw the chat example where the IDisconnect interface was implemented. De Disconnect() function is called when a page is refreshed or closed, for example. It's working ok, but how to detect which one was disconnected ?

There's a Client id property on the Hub (Context.ClientId) that you can use to figure out which client disconnected.