private void pictureBox1_Click(object sender, EventArgs e) { Graphics g = pictureBox1.CreateGraphics(); Pen olovka = new Pen(Color.Red, 3); float k = float.Parse(textBox1.Text); float n = float.Parse(textBox2.Text); float x = 0F; for ( x = 0F; x < 100F; x=x+0.1F) { float y=k*x+n; PointF A = new PointF(x, y); PointF B = new PointF(x + 1, y); g.DrawLine(olovka, A, B); } }