Sinus

        private void Form1_Load(object sender, EventArgs e)
        {
            Bitmap b = new Bitmap(Width, Height);
            for (int i = 0; i < this.Width; i++)
            {
                Graphics g = Graphics.FromImage(b);
                g.DrawLine(new Pen(Brushes.Black), i - 1, (float)Math.Sin(Math.PI * (i - 1) / 180) * b.Height / 4 + this.Height / 2,
                    i, (float)Math.Sin(Math.PI * i / 180) * b.Height / 4 + this.Height / 2);
               
            }
            this.BackgroundImage = b;
        }