Fill Background of a Control with Gradient

        /// <summary>
        /// Paints a gradient to the Control's background
        /// </summary>
        /// <param name="ctrl">Control that needs the brush up</param>
        /// <param name="color1">e.g. Color.FromArgb(120, 180, 255), or Color.Yellow</param>
        /// <param name="color2"></param>
        /// <param name="angle">0: horizontal, 45: top-left to bottom-right, etc.</param>
        private void PaintGradientBackground(Control ctrl, Color color1, Color color2, float angle)
        {
            Rectangle rect = new Rectangle(ctrl.Location, ctrl.Size);
 
            System.Drawing.Drawing2D.LinearGradientBrush gradBrush =
                new System.Drawing.Drawing2D.LinearGradientBrush(rect, color1, color2, angle);
 
            Bitmap bmp = new Bitmap(rect.Width, rect.Height);
 
            Graphics g = Graphics.FromImage(bmp);
            g.FillRectangle(gradBrush, rect);
 
            ctrl.BackgroundImage = bmp;
            ctrl.BackgroundImageLayout = ImageLayout.Stretch;
        }