private void btnnew_staff_Click(object sender, EventArgs e)
        {
            status = "new";
            sms_create_staff staff = new sms_create_staff(status, staffid);

            staff.ShowDialog();
        }
        private void editRecordToolStripMenuItem_Click(object sender, EventArgs e)
        {
            status = "old";
            sms_create_staff staff = new sms_create_staff(status, staffid);

            staff.ShowDialog();
        }