[C#]
Canvas canvas = new Canvas(50, 50, new XColor(Color.Red));
canvas.Color.Color = Color.Blue;
canvas.Width = 100;
canvas.Height = 100;
canvas.SaveAs(Server.MapPath("erase1.gif"));
canvas.Erase();
canvas.SaveAs(Server.MapPath("erase2.gif"));
[Visual Basic]
Dim ca As New Canvas(50, 50, New XColor(Color.Red))
ca.Color.Color = Color.Blue
ca.Width = 100
ca.Height = 100
ca.SaveAs(Server.MapPath("erase1.gif"))
ca.Erase()
ca.SaveAs(Server.MapPath("erase2.gif"))
Sample files are shown below.

erase1.gif

erase2.gif
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