protected void gvCart_RowDeleting(object sender, GridViewDeleteEventArgs e) { DataTable dt = (DataTable)Session["GioHang"]; string ma = gvCart.Rows[e.RowIndex].Cells[0].Text; cls.DeleteRow(dt, ma); gvCart.DataSource = dt; gvCart.DataBind(); lbTongTien_Load(sender, e); }