c#打印一个Windows窗体应用程序

我发现这段代码打印

// The PrintDialog will print the document
// by handling the document's PrintPage event.
private void document_PrintPage(object sender, 
System.Drawing.Printing.PrintPageEventArgs e)
{
    // Insert code to render the page here.
    // This code will be called when the control is drawn.
    // The following code will render a simple
    // message on the printed document.
    string text = "In document_PrintPage method.";
    System.Drawing.Font printFont = new System.Drawing.Font
        ("Arial", 35, System.Drawing.FontStyle.Regular);
    // Draw the content.
    e.Graphics.DrawString(text, printFont, 
        System.Drawing.Brushes.Black, 10, 10);
}

// Declare the PrintDocument object.
private System.Drawing.Printing.PrintDocument docToPrint =
    new System.Drawing.Printing.PrintDocument();
private void printButton_Click(object sender, EventArgs e)
{
    PrintDialog PrintDialog1 = new PrintDialog();
    // Allow the user to choose the page range he or she would
    // like to print.
    PrintDialog1.AllowSomePages = true;
    // Show the help button.
    PrintDialog1.ShowHelp = true;
    // Set the Document property to the PrintDocument for 
    // which the PrintPage Event has been handled. To display the
    // dialog, either this property or the PrinterSettings property 
    // must be set 
    PrintDialog1.Document = docToPrint;
    DialogResult result = PrintDialog1.ShowDialog();
    // If the result is OK then print the document.
    if (result == DialogResult.OK)
    {
        docToPrint.Print();
    }
}

我执行它，打印的结果是一个empty page，我的问题是我在哪里可以把数据打印?以及如何将打印的数据作为行，每一行都有标签和值。