Clear Method

using Leadtools.Windows.D2DRendering; 
 
public void D2DSurfacePushLayerExample() 
{ 
   //Create a new instance of the D2DSurface object 
   D2DSurface d2dSurface = new D2DSurface(); 
 
   //Set the surface Size 
   d2dSurface.SurfaceSize = new Size(1000, 1000); 
 
   //Pass an empty rect to redraw the entire surface 
   d2dSurface.BeginDraw(Rect.Empty); 
 
   //Save the surface drawing state 
   D2DDrawingState drawingState = d2dSurface.Save(); 
 
   //Create an ellipse geometry 
   EllipseGeometry ellipse = new EllipseGeometry(); 
   ellipse.Center = new Point(500, 500); 
   ellipse.RadiusX = 100; 
   ellipse.RadiusY = 100; 
 
   GeometryGroup geometryGroup = new GeometryGroup(); 
   geometryGroup.Children.Add(ellipse); 
 
   //Push geometry to receive all subsequent drawing operations  
   d2dSurface.PushLayer(geometryGroup); 
 
   //Create a rect having the specified dimensions 
   Rect rect = new Rect(40, 40, 500, 200); 
 
   //Create a new instance of a brush from a new solid color brush 
   SolidColorBrush fill = new SolidColorBrush(Colors.Green); 
 
   //Clear the pushed Layer with the fill brush 
   d2dSurface.Clear(fill); 
 
   //Stop redirecting drawing operations to the layer 
   d2dSurface.PopLayer(); 
 
   //Restore the surface drawing state 
   d2dSurface.Restore(drawingState); 
 
   //End the Draw operation and invalidate the surface 
   d2dSurface.EndDraw(); 
 
   d2dSurface.Invalidate(Rect.Empty); 
}