c# graphics draw filled rectangle
private void FillRectangleRectangle(PaintEventArgs e)
{
// Create solid brush.
SolidBrush blueBrush = new SolidBrush(Color.Blue);
// Create rectangle.
Rectangle rect = new Rectangle(0, 0, 200, 200);
// Fill rectangle to screen.
e.Graphics.FillRectangle(blueBrush, rect);
}