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private void Form1_Paint(object sender, PaintEventArgs e)
{
e.Graphics.FillRectangle(new SolidBrush(Color.FromArgb(120, 0, 0, 0)), new RectangleF(25, 25, 200, 200));
e.Graphics.FillRectangle(new SolidBrush(Color.FromArgb(100, 255, 0, 200)), new RectangleF(10, 10, 200, 200));
}
<Rectangle Margin="84,52,356,157" Fill="#FFC92F2F" Opacity="0.495" >
<Rectangle.Effect>
<DropShadowEffect ShadowDepth="10" Opacity="0.9"/>
</Rectangle.Effect>
</Rectangle>