private void 修改ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            frm_User_Alter fva1 = null;

            if (dataGridView1.RowCount > 0)
            {
                string str1 = dataGridView1.SelectedRows[0].Cells[0].Value.ToString();
                fva1 = new frm_User_Alter(str1);
            }
            else
            {
                fva1 = new frm_User_Alter();
            }
            if (fva1.ShowDialog() == System.Windows.Forms.DialogResult.Yes)
            {
                frm_User_Display_Load(null, null);
            }
        }
        private void 修改员工ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            frm_User_Alter fua1 = new frm_User_Alter();

            fua1.ShowDialog();
        }