private void btnAdd_Click(object sender, EventArgs e)
        {
            NewUnitForm addUnit = new NewUnitForm(null);

            if (addUnit.ShowDialog() == DialogResult.OK)
            {
                UpdateUnitList();
            }
        }
 private void btnEdit_Click(object sender, EventArgs e)
 {
     if (dgvDetail.SelectedRows.Count >= 1)
     {
         UnitExt extObj = (UnitExt)dgvDetail.SelectedRows[0].Tag;
         if (extObj.IsUserAdded == 1)
         {
             NewUnitForm addUnit = new NewUnitForm(extObj);
             if (addUnit.ShowDialog() == DialogResult.OK)
             {
                 UpdateUnitList();
             }
         }
         else
         {
             MessageBox.Show("对不起,只能编辑用户自定义的单位!");
         }
     }
 }