What are the techniques of handling concurrency in Asp.net website?

ASP.Net used to handle concurrency by making web pages implement the IHttpAsyncHandler interface (you can do this by declaring your page like this ) Please refer to this article which describes the process in detail: http://msdn.microsoft.com/en-us/magazine/cc163725.aspx Modern websites may use SignalR (http://signalr.net/) to provide real time concurrent functionalities like chatting.