private void 新增ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            frm_User_Add fva1 = new frm_User_Add();

            if (fva1.ShowDialog() == System.Windows.Forms.DialogResult.Yes)
            {
                frm_User_Display_Load(null, null);
            }
        }
        /// <summary>
        /// 员工管理子系统。包含新增员工、修改员工、删除员工、查看员工列表;
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void 新增员工ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            frm_User_Add fua1 = new frm_User_Add();

            fua1.ShowDialog();
        }