I am drawing a rectangle in millimeter on a panel using the following code in c# by entering the width and length in mm at runtime. however the resultant rectangle drawn varies in size in different monitors. I want the rectangle to appear same size irrespective of the running the app in any monitor. Can any1 help me?. currently the width for 10mm measures 12mm and length for 10mm shows 11mm using a scale. I tested the appn on different monitors, there again it shows different length. Is ther anyway that i can show it to be of same width and length?

void panel1_Paint(object sender, PaintEventArgs e)
        {

            SolidBrush ygBrush = new SolidBrush(Color.YellowGreen);
            g = panel1.CreateGraphics();
            g.PageUnit = GraphicsUnit.Millimeter;

            int w = Int32.Parse(textBox1.Text.ToString());
            int h = Int32.Parse(textBox2.Text.ToString());

            rct = new Rectangle(94, 27, w, h);
            g.FillRectangle(ygBrush, rct);


        }