GetZsFromSurfaceAsync

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namespace BeforeSketchCompleted {   internal class BeforeSketchCompleted : Button   {     readonly string surfaceName = "Ground";     ArcGIS.Core.Events.SubscriptionToken bscToken = null;           protected override void OnClick()     {       //subscribe to BeforeSketchCompleted event once       if (bscToken == null)         bscToken = ArcGIS.Desktop.Mapping.Events.BeforeSketchCompletedEvent.Subscribe(OnBeforeSketchCompletedEvent);     }       private async Task OnBeforeSketchCompletedEvent(BeforeSketchCompletedEventArgs arg)     {       //check if surfacename is in the map       if (arg.MapView.Map.ElevationSurfaces.Count(s => s.Name == surfaceName) == 0)       {         MessageBox.Show("Surface: " + surfaceName + " is not in the map");         return;       }         //set the sketch Z values from the specified elevation surface       var ZResult = await arg.MapView.Map.GetZsFromSurfaceAsync(arg.Sketch,surfaceName);       if (ZResult.Status == SurfaceZsResultStatus.Ok)         arg.SetSketchGeometry(ZResult.Geometry);     }