Printing in .NET - Conversion from Millimeter to Pixel

Question

How can I convert user input from millimeter to pixels so that it prints in the correct position on the page?

I am using the following code:

private void document_PrintPage(object sender, PrintPageEventArgs e)
{
    float dpiX = e.Graphics.DpiX;
    float dpiY = e.Graphics.DpiY;
    Point p = new Point(mmToPixel(float.Parse(edtBorderLeft.Text), dpiX), 
            mmToPixel(float.Parse(edtBorderTop.Text), dpiY));
    e.Graphics.DrawImage(testImage, p);

}

private int mmToPixel(float mm, float dpi)
{
    return (int)Math.Round((mm / 25.4)  * dpi);
}

edtBorderLeft.Text got the value "9.5" and edtBorderTop.Text got the value "21.5". These values ​​are millimeters. If I check the output with this code:

    private void printPage()
    {
        PrintDialog dialog = new PrintDialog();
        dialog.Document = document;
        if (dialog.ShowDialog() == System.Windows.Forms.DialogResult.OK)
        {
            PrintPreviewDialog preview = new PrintPreviewDialog();
            preview.Document = document;
            preview.AutoSizeMode = System.Windows.Forms.AutoSizeMode.GrowAndShrink;
            preview.Show();
            //document.Print();
        }            
    }

It displays an image almost in the center of the page. Calculation example:

mmToPixel (float.Parse (edtBorderLeft.Text), dpiX) edtBorderLeft.Text = "9.5" dpiX = 600; returns: 224

How to calculate the correct point for a printed image?

Answer 1

. . :

 e.Graphics.PageUnit = GraphicsUnit.Millimeter;

e.Graphics.PageUnit = GraphicsUnit.Pixel;

.

Answer 2

. Graphics.PageUhit "Display". 96 , - 100 . MSDN, .

dpiX/dpiY 100, , , .