protected void btnRemove_Click(object sender, System.EventArgs e)
        {
            try
            {
                foreach (string[] keys in _gr.SelectedPrimaryKeys)
                {
                    _report.RemoveProductSerNo(keys[0]);
                }

                _report.SaveState();
            }
            catch (Exception exc)
            {
                this.ShowException(exc);
            }
        }
 protected void btnBack_Click(object sender, System.EventArgs e)
 {
     _report.SaveState();
     Response.Redirect("Design.aspx?content=Design", true);
 }