public MapTool1()
        {
            IsSketchTool = true;
            SketchType = SketchGeometryType.Line;
            SketchOutputMode = SketchOutputMode.Map;
        }

        protected override Task OnToolActivateAsync(bool active)
        {
            return base.OnToolActivateAsync(active);
        }

        
 
protected async override Task<bool> OnSketchCompleteAsync(Geometry geometry)
        {
            var polyline = geometry as Polyline;
            if (polyline != null)
            {
                var sR = polyline.SpatialReference;
                
                
                // make more vertices ... using tolerance to cover projected / non-projected coord systems
 

                var denseDistance = sR.XYTolerance * 1000;
                var denseLine = GeometryEngine.Instance.DensifyByLength(polyline, denseDistance) as Polyline;

                await QueuedTask.Run(() =>
                {
                    //var movedZup = GeometryEngine.Instance.Move(result.Geometry, 0, 0, 1) as Polyline;
 

                    ActiveMapView.AddOverlay(polyline);
                  


                });

            }
            return true;

        }