well this is one of my old blog posts i'll be resposting them by time ammong new ones here we go this is very important if i have a request that i have issued using asp.net ajax client library this is how to cancel it 1: serviceHandler = new ServiceName().methodName(param1, param2, completeHendler ,errorHandler ); 2: // just keep the serviceHandler variable in a handy scope 3: // and when the user doesn't want this request anymore 4: if (serviceHandler!=null) 5: serviceHandler.get_executor().abort();