private void MyMap_MouseClick(object sender, ESRI.ArcGIS.Client.Map.MouseEventArgs e) { try { ArcGISImageServiceLayer imageLayer = MyMap.Layers["ImageServiceLayer"] as ArcGISImageServiceLayer; MosaicRule mosaicRule = new MosaicRule(); mosaicRule.MosaicMethod = "esriMosaicViewpoint"; mosaicRule.Viewpoint = e.MapPoint; imageLayer.MosaicRule = mosaicRule; imageLayer.Refresh(); } catch (Exception ex) { MessageBox.Show(ex.Message); } }