System.Windows.Forms.Control
System.Windows.Forms.Form
OnPaint
Paint
System.Drawing.Graphics
Control.Invalidate
PAINT
Rectangle
Region
System.Windows.Forms.PictireBox
e.Graphics.FillEllipse(Brushes.CornflowerBlue, 100, 100, 100, 100); e.Graphics.DrawEllipse(Pens.Green, 100, 100, 100, 100);
var
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