true if the client is still connected, false otherwise.
The HttpResponse.IsClientConnected property returns false when the following conditions are true:
The connection to the client was terminated. This can occur if the HttpResponse.Close method was invoked, or if the client stopped execution of the Web page or browsed to another page.
The System.Web.HttpWorkerRequest object that is handling the request is null or the HttpWorkerRequest.IsClientConnected method returns false. If a custom System.Web.HttpWorkerRequest object handles the request, then the HttpWorkerRequest.IsClientConnected method might be set based on custom criteria. For example, the custom worker request might force a time-out after a period of time.