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private void Print()
{
string str = File.ReadAllText(Application.StartupPath + @"..\\cup\\receipt.txt", System.Text.Encoding.Default);
this.richTextBox1.Text = str;
printDocument1.PrinterSettings.PrinterName = "TP MB520-C6";
this.printDocument1.Print();
}
private void printDocument1_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)
{
e.Graphics.DrawString(this.richTextBox1.Text, new Font("宋体", 12), Brushes.Black, new Point(20, 200));
}