How to increase the height of curve in windows forms

I want to increase the height of the curve but its left and right position should remain same. Just want to lift up from center to give it a shape like curve as height changes.

Pen blackPen = new Pen(Color.Black, 3);

      // Create coordinates of rectangle to bound ellipse. 
      int x = 93;
      int y = 136;
      int width = 320;
      int height = 50;

      // Create start and sweep angles on ellipse. 
      int startAngle = 0;
      int sweepAngle = -180;

      // Draw arc to screen.
 e.Graphics.DrawArc(blackPen, x, y, width, height, startAngle, sweepAngle);