public void NguyenLieu_Insert() { NguyenLieuDTO nguyenlieu = new NguyenLieuDTO(); nguyenlieu.MaNl = txtnguyenlieu.Text; nguyenlieu.TenNl = cbnguyenlieu.Text; DataTable dt = nguyenlieu_bus.NguyenLieu_Insert(nguyenlieu); MessageBox.Show(dt.Rows[0][0].ToString(), "Thông báo", MessageBoxButtons.OK); }