protected void btnLuuKH_Click(object sender, EventArgs e) { DTOLoaiKH dtoLKH = new DTOLoaiKH(); dtoLKH.TenLKH = txtTenLKH.Text; DAO_Entity daoLKH = new DAO_Entity(); if (KiemTraNhap() == "") { daoLKH.ThemLoaiKH(dtoLKH); Response.Redirect("~/QLBophan_Admin/QLCauHinhLoaiKH/LoaiKH.aspx"); } else { ThemLoaiKH.Visible = true; lbLoi.Text = KiemTraNhap(); } }