void ProgramStart(object item)
        {
            string filename = "D://WhiteXML.xml";

            if (!File.Exists(filename))
            {
                XmlDocument doc         = new XmlDocument();
                XmlElement  rootElement = doc.CreateElement("root");
                doc.AppendChild(rootElement);
                XmlNode    xn           = doc.SelectSingleNode("root");
                XmlElement childElement = doc.CreateElement("WhiteList");
                XmlElement URLElement   = doc.CreateElement("URL");
                URLElement.InnerText = " ";
                childElement.AppendChild(URLElement);
                rootElement.AppendChild(childElement);
                doc.Save(filename);
                XMLDAL.Insert(" ");
            }
            XmlDocument readxml = new XmlDocument();

            readxml.Load(filename);
            XmlElement xnn = readxml.DocumentElement;

            ReadX(xnn);
        }
 private void BT_Add_Click(object sender, EventArgs e)
 {
     if (tb_add_white.Text != string.Empty)
     {
         XMLDAL.Insert(tb_add_white.Text);
         Load_WhiteList();
     }
     else
     {
         MessageBox.Show("请填写添加项!");
     }
 }
        private void BT_Del_Click(object sender, EventArgs e)
        {
            XmlDocument delxml = new XmlDocument();

            delxml.Load(filename);
            XmlNode rootnode = delxml.DocumentElement;
            string  del_url  = "";

            del_url = LB_White.SelectedItem.ToString();
            if (MessageBox.Show("确定要将" + del_url + "移除白名单?", "", MessageBoxButtons.OKCancel) == DialogResult.OK)
            {
                XMLDAL.Delete(rootnode, del_url);
                MessageBox.Show("已将" + del_url + "移除白名单");
                delxml.Save(filename);
                Load_WhiteList();
            }
        }