protected void btnEdit_Click(object sender, EventArgs e)
        {
            try
            {
                if (ddlNgayThucAnThua.SelectedValue != "" && ddlNgayThucAnThua.SelectedValue != null)
                {
                    txtNgayAn.Text        = ddlNgayThucAnThua.SelectedItem.Text;
                    hdListChuong.Value    = "";
                    hdListTenChuong.Value = "";
                    hdListThua.Value      = "";
                    DataTable tblDetails = csCont.CaSauAn_GetCaSauAnThuaByCaSauAn(int.Parse(ddlNgayThucAnThua.SelectedValue));
                    foreach (DataRow r in tblDetails.Rows)
                    {
                        hdListChuong.Value    += ";" + r["Chuong"].ToString();
                        hdListTenChuong.Value += ";" + r["TenChuong"].ToString();
                        hdListThua.Value      += ";" + r["Thua"].ToString();
                    }
                    if (hdListChuong.Value != "")
                    {
                        hdListChuong.Value = hdListChuong.Value.Substring(1);
                    }
                    if (hdListTenChuong.Value != "")
                    {
                        hdListTenChuong.Value = hdListTenChuong.Value.Substring(1);
                    }
                    if (hdListThua.Value != "")
                    {
                        hdListThua.Value = hdListThua.Value.Substring(1);
                    }

                    Page.ClientScript.RegisterStartupScript(typeof(string), "initDetails", "<script language=javascript>bindChuong();</script>", false);
                }
            }
            catch (Exception ex)
            {
                Response.Write(ex.Message);
            }
        }