打印前显示printDocument /如何定义PoinF

我在c# windows应用程序WinForms中使用PrintDialog和PrintDocument来打印文档。

打印工作很好，但我想在打印前显示文档，这样我就可以检查DrawString的PointF是否像我想要的那样。我怎么能做到呢?有什么工具可以很容易地在A4文件上定义一个点吗?

private void buttonPrintShows_Click(object sender, EventArgs e)
        {
            PrintDialog pd = new PrintDialog();
            pd.Document = printDocumentStatistic;
            if (pd.ShowDialog() == DialogResult.OK)
            {
                printDocumentStatistic.Print();
            }
        }
private void printDocumentStatistic_PrintPage(object sender, PrintPageEventArgs e)
    {
        e.Graphics.DrawString("Shows:",new System.Drawing.Font("Arial", 20f), new SolidBrush(Color.Red), new PointF(35, 50));
        e.Graphics.DrawString("Act:", new System.Drawing.Font("Arial", 20f), new SolidBrush(Color.Red), new PointF(35, 75));
        e.Graphics.DrawString(show_name, new System.Drawing.Font("Arial", 20f), new SolidBrush(Color.Red), new PointF(100, 50));
        e.Graphics.DrawString(akt_name, new System.Drawing.Font("Arial", 20f), new SolidBrush(Color.Red), new PointF(100, 75));
    }