protected void btn_Delete_Click(object sender, EventArgs e) { if (TB_ID_Delete.Text == "") { TB_Error_Delete.Text = "Please Enter a product ID"; TB_Error_Delete.Visible = true; } else { //delete product Bookstore_BO bookstorebo = new Bookstore_BO(); bookstorebo.deleteProduct(TB_ID_Delete.Text); TB_ID_Delete.Text = ""; lbl_Message2.Visible = true; lbl_Message2.Text = "Product has been deleted successfully!"; TB_Error_Delete.Text = ""; TB_Error_Delete.Visible = false; } }