If you press Ctrl+F while Visual Studio (or whatever IDE you use) has focus, it'll bring up a search button. You can adjust the search options to search through the entire solution. From there, the search term I chose was ".Abort();". I came up with 4 results:
TNTcpLobbyServer.cs - Stop() function
TNUPnP.cs - Close() function
TNGameServer.cs - Stop() function
TNUdpLobbyServer.cs - Stop() function