private void LoadPageWithListener()
        {
            //Java script listener object
            var jsListener= @"function JsListener() {
	                            this.Cancel = function () {
                                    jsCsCancelCalled();    		                        
	                            }	
                            }
                            var jsListenerObj = new JsListener();";

            //Register new C# callback method
            webView.RegisterJSExtensionFunction("jsCsCancelCalled", OnCancelListener);
            
            //Append java script listener
            webView.EvalScript(jsListener);

            var url = "server/frame?listener= jsListenerObj";

            //Load the URL request with the JsListener instance name as parameter 
            webView.LoadUrl(url);
        }

        private void OnCancelListener(object sender, JSExtInvokeArgs e)
        {
        }