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LinearGradientBrush brush = new LinearGradientBrush(this.ClientRectangle,
                Color.FromKnownColor(KnownColor.Control),Color.FromKnownColor(KnownColor.ControlDark) , LinearGradientMode.Horizontal);

            System.Drawing.SolidBrush b = new SolidBrush(Color.Red);

            Graphics g = this.CreateGraphics();
            g.FillRectangle(brush, this.ClientRectangle);
            g.DrawString("渐变了啊", this.Font, b, 5, 2);