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;    //去掉对话框的顶级属性                    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();                                                      }}