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  private void btn_UpdateGroup_Click(object sender, EventArgs e)
        {  
            XmlDocument xmlDoc = new XmlDocument();
            xmlDoc.Load("...\\...\\group.xml");
            XmlNodeList list = xmlDoc.SelectSingleNode("grouplist").ChildNodes;//»ñµÃ¸ù½ÚµãgrouplistϵÄËùÓÐ×Ó½Úµã //±éÀúËùÓÐ×ӽڵ㠠   
            foreach (XmlNode node in list)
            {
                XmlElement xe = (XmlElement)node;//½«×Ó½ÚµãÀàÐÍת»»ÎªXmlElementÀàÐÍ
                string departmentName = this.listBox_Group.SelectedItem.ToString();
                string[] array1 = new string[2];
                array1 = departmentName.Split(' ');
                if (xe.GetAttribute("id") == array1 [1])//¸ù¾Ý²¿ÃźŵÄIDÖµ£¬ÕÒµ½ÆäÔÚXMLÖеĽáµã£¬½«ÆäÐ޸ijÉtextBoxÖеÄÖµ
                {
                    xe.InnerText = tbx_NewGroupName.Text;//½«XMLÖеIJ¿ÃÅÃûÐ޸ijÇtextboxÖеÄÐÂÃû³Æ¡£
                }