private void listView1_SelectedIndexChanged(object sender, EventArgs e)
        {
 listView1.FullRowSelect = true;
            IDC_DIALOG1 menu1 = new IDC_DIALOG1();
            IC_DIALOG2 datas = new IC_DIALOG2();
            for (int j = listView1.SelectedIndices.Count - 1; j >= 0; j--)    //判断选中哪项
            {
                string listname = listView1.SelectedItems[0].Text;    //取出选中的名字
                if (listname == "安全设置") {        //根据选中的名字来判断用哪一个对话框
                    this.panel1.Controls.Clear();    //先清空panel当中的所用内容
                    menu1.TopLevel = false;    //去掉对话框的*属性
                    menu1.Dock = System.Windows.Forms.DockStyle.Fill;//让对话框全屏适应panel
                    this.panel1.Controls.Add(menu1); //添加到容器panel当中
                    menu1.Show(); //显示这个对话框
                   
                   
                }
                else if (listname == "数据管理") {
                    this.panel1.Controls.Clear();
                    datas.TopLevel = false;
                    datas.Dock = System.Windows.Forms.DockStyle.Fill;
                    this.panel1.Controls.Add(datas);
                    datas.Show();
                   
                   
                }

}