private void MyRouteTask_Failed(object sender, TaskFailedEventArgs e)
        {
            string errorMessage = "Routing error: ";
            errorMessage += e.Error.Message;
            foreach (string detail in (e.Error as ServiceException).Details)
                errorMessage += "," + detail;

            MessageBox.Show(errorMessage);

            stopsGraphicsLayer.Graphics.RemoveAt(stopsGraphicsLayer.Graphics.Count - 1);
        }

		private void task_Fault(object sender, TaskFailedEventArgs args)
		{
			base.OnProgress(100);
			InitializationFailure = args.Error;
			base.Initialize();
		}

 private void GeometryService_Failed(object sender, TaskFailedEventArgs e)
 {
     MessageBox.Show("Geometry Service error: " + e.Error);
 }

        /// <summary>
        /// Handles failed QueryTask by displaying an error message. 
        /// </summary>
        private void QueryTask_Failed(object sender, TaskFailedEventArgs e)
        {
            // Unhook the queryTask.Failed even
            queryTask.Failed -= QueryTask_Failed;

            // Show failure error message
            TextBlock failureText = new TextBlock()
            {
                Margin = new Thickness(10),
                Text = e.Error.Message
            };
            string windowTitle = string.Format("{0}", "Error");

            MapApplication.Current.ShowWindow(windowTitle, failureText, true);
        }

 private void FeatureLayer_UpdateFailed(object sender, TaskFailedEventArgs e)
 {
 }

        private void task_Failed(object sender, TaskFailedEventArgs e)
        {
            string errorMessage = "Routing error: ";
            errorMessage += e.Error.Message;
            foreach (string detail in (e.Error as ServiceException).Details)
                errorMessage += "," + detail;

            MessageBox.Show(errorMessage);
        }

 void featureLayer_UpdateFailed(object sender, TaskFailedEventArgs e)
 {
     MessageBox.Show(e.Error.Message,
         "FeatureLayer update failed", MessageBoxButton.OK);
 }

 // Raised when the locator search fails
 private void Locator_Failed(object sender, TaskFailedEventArgs e)
 {
     IsSearching = false; // Reset busy state
     OnSearchFailed(e.Error); // Raise failed event
 }

 private void GeoprocessorTask_Failed(object sender, TaskFailedEventArgs e)
 {
     InformationText.Text = descText;
     jobid = null;
     MessageBox.Show("Geoprocessing service failed: " + e.Error);
 }

 private void QueryTask_Failed(object sender, TaskFailedEventArgs args)
 {
     MessageBox.Show("Query failed: " + args.Error);
     MyDrawObject.IsEnabled = true;
 }

 private void LocatorTask_Failed(object sender, TaskFailedEventArgs e)
 {
     MessageBox.Show("Locator service failed: " + e.Error);
 }

 private void QueryTaskFailed(object sender, TaskFailedEventArgs args)
 {
     QueryCompleted(0, (QueryType) args.UserState);
 }

 void gpAircraftRouteGen_Failed(object sender, TaskFailedEventArgs e)
 {
     System.Diagnostics.Debug.WriteLine(e.Error.ToString());
 }

 private void FindTask_Failed(object sender, TaskFailedEventArgs args)
 {
     MessageBox.Show("Find failed: " + args.Error);
 }

 private void LocationToAddressLocatorTask_Failed(object sender, TaskFailedEventArgs e)
 {
     MessageBox.Show("Unable to determine an address. Try selecting a location closer to a street.");
 }

 void OnFeatureLayerUpdateFailed(object sender, TaskFailedEventArgs e)
 {
     ResetGraphicsLayer();
 }

 private void GeoprocessorTask_Failed(object sender, TaskFailedEventArgs e)
 {
     MessageBox.Show("Geoprocessing service failed: " + e.Error);
 }

 void _geoprocessorTask_Failed(object sender, TaskFailedEventArgs e)
 {
     MessageBox.Show("Extract data task failed: " + e.Error.Message);
 }

 void generateRendererTask_Failed(object sender, TaskFailedEventArgs e)
 {
     MessageBox.Show("Error: " + e.Error.Message);
 }

 private void QueryTask_Failed( object sender, TaskFailedEventArgs args )
 {
     HtmlPage.Window.Alert( args.Error.Message );
 }