public void teafrang(Control a, LinearGradientMode _direction, Color _gradientColorStart, Color _gradientColorEnd)

{

LinearGradientBrush gradBrush;

gradBrush = new LinearGradientBrush(new Rectangle(0, 0, a.Width, a.Height), _gradientColorStart, _gradientColorEnd, _direction);

Bitmap bmp = new Bitmap(a.Width, a.Height);

Graphics g = Graphics.FromImage(bmp);

g.FillRectangle(gradBrush, new Rectangle(0, 0, a.Width, a.Height));

a.BackgroundImage = bmp;

a.BackgroundImageLayout = ImageLayout.Stretch;

}

private void Form1_Load(object sender, EventArgs e)

{

teafrang(this, LinearGradientMode.Vertical, Color.Blue, Color.Red);

}