求高手封装成一个方法,该怎么解决

 private void Form1_Load(object sender, EventArgs e)        {            PrintDocument prtdoc = new PrintDocument();            printerList.Items.Clear();//清空ComboBox            string strDefaultPrinter = prtdoc.PrinterSettings.PrinterName;//获取默认的打印机名             foreach (String strPrinter in PrinterSettings.InstalledPrinters)            //在列表框中列出所有的打印机,             {                printerList.Items.Add(strPrinter);                if (strPrinter == strDefaultPrinter)//把默认打印机设为缺省值                 {                    printerList.SelectedIndex = printerList.Items.IndexOf(strPrinter);                }            }        }