Form1.cs

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.IO;

namespace PrintPreviewRichTextBox
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        // print command implemented using RichTextBoxDocument class
        void printToolStripButton_Click(object sender, EventArgs e)
        {
            // create document
            var doc = new RichTextBoxDocument(richTextBox1);

            // set document header and footer
            // use '[page]' to get the current page number in headers and footers
            // use '[pages]' to get the page count in headers and footers
            doc.Header = string.Format("\t - 新益康打印控件测试 - \r\n** {0} **", richTextBox1.Name);
            doc.Footer = string.Format("{0}\t{1}\t页数 [page] of [pages]", 
                DateTime.Today.ToShortDateString(), 
                DateTime.Now.ToShortTimeString());

            // preview the document
            //using (var dlg = new PrintPreviewDialog()) // also works, but not as nice...
            using (var dlg = new CoolPrintPreview.CoolPrintPreviewDialog())
            {
                dlg.Document = doc;
                dlg.ShowDialog(this);
            }
        }

        // simple implementation of standard file commands (new, open, save)
        void newToolStripButton_Click(object sender, EventArgs e)
        {
            richTextBox1.Clear();
        }
        void openToolStripButton_Click(object sender, EventArgs e)
        {
            using (var dlg = new OpenFileDialog())
            {
                dlg.DefaultExt = ".rtf";
                if (dlg.ShowDialog() == DialogResult.OK)
                {
                    try
                    {
                        richTextBox1.LoadFile(dlg.FileName);
                    }
                    catch (Exception x)
                    {
                        MessageBox.Show(x.Message, Application.ProductName, MessageBoxButtons.OK, MessageBoxIcon.Error);