private void tim_icon_Tick(object sender, EventArgs e)
        {if (sys_UserID != "" && sys_UserID != null)
            {
                XmlDocument xmldoc = new XmlDocument();
                xmldoc.Load("http://localhost:3711/WebMiddle/ChatList.aspx?uid=" + sys_UserID + "&fsid=" + sys_fsid + "&hash=" + chkHash);
                XmlNodeList lists = xmldoc.SelectNodes("/root/names");
                if (lists.Count > 0)
                {
                    ToolStripMenuItem item = null;
                    foreach (XmlNode xn in lists)
                    {
                        item = new ToolStripMenuItem();
                        item.Name = "chatuser_" + xn.ChildNodes[2].InnerText.ToString() + "-" + xn.ChildNodes[1].InnerText.ToString();
                        item.Text = xn.ChildNodes[0].InnerText.ToString() + "     (" + xn.ChildNodes[3].InnerText.ToString() + ")";
                        item.Click += new EventHandler(contextList_item_Click);
                        item.Size = new System.Drawing.Size(100, 50);

                        contextList.Items.Add(item);

                    }
                }
}