private void HienThiDanhSach()
        {
            string macongty    = Session["congty"].ToString();
            string manguoidung = Session["user"].ToString();
            string ngonngu     = Session["languege"].ToString();

            if (ngonngu == "lbl_VN")
            {
                GridView1.DataSource = dal.DanhSachVanBanDaGuiTheoNguoiGui(manguoidung, macongty);
                GridView1.DataBind();
            }
            else if (ngonngu == "lbl_TW")
            {
                GridView1.DataSource = dal.DanhSachVanBanDaGuiTheoNguoiGuiTW(manguoidung, macongty);
                GridView1.DataBind();
            }
            else if (ngonngu == "lbl_EN")
            {
                GridView1.DataSource = dal.DanhSachVanBanDaGuiTheoNguoiGuiEN(manguoidung, macongty);
                GridView1.DataBind();
            }
        }