private void GetPrinte()
        {
            System.Drawing.Printing.PrintDocument print = new System.Drawing.Printing.PrintDocument();
            string sDefault = print.PrinterSettings.PrinterName;//默认打印机名
            foreach (string sPrint in System.Drawing.Printing.PrinterSettings.InstalledPrinters)//获取所有打印机名称
            {              
                comPrint.Items.Add(sPrint);      
            }
        }