public void layTour(string id)
{
idkhhidden.InnerHtml = "<input type='hidden' id='idkhh' value='" + id + "'>";
KhachHangModel khachHangModel = new KhachHangModel();
tenKhachHAng.InnerHtml = "Khách Hàng: " + khachHangModel.layTenKhachHang(id);
rptour.DataSource = tourModel.layTourtt1();
rptour.DataBind();
}