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LiveSupportChat is an open source simple online support chat demo application. It has used ASP.Net web form (C#) and SignalR.
Testing Instruction :
1. Run the application
2. Open OperatorLogin.aspx
3. Click 'Operator Login And Go To Support Online' button.
4. Open OnlineSupport.aspx in other browser to simulate user (if operator browser is IE then this should be Chrome or Firefox)
5. Now try sending message as both user and operator from their respective browser