มีเรื่องให้ช่วยหน่อยครับเกี่ยวกับการเพิ่มข้อมูลลงใน MSAccess C#

private void button1_Click(object sender, EventArgs e)
        {
            System.Data.OleDb.OleDbConnection conn = new System.Data.OleDb.OleDbConnection();
            string strPro = @"Provider=Microsoft.Jet.Oledb.4.0;Data Source=C:\Users\GOFFBEES\Desktop\product_db.mdb";
            conn.ConnectionString = strPro;
            conn.Open();

            string SQL;
            SQL = "Insert into tbl_product
(product_id,product_name,product_desc,prodct_price,product_in_stock,product_re_order)";
            SQL += "values ('" + tbproduct_id.Text + "','" + tbproduct_name.Text + "'";
            SQL += ",'" + tbproduct_desc.Text + "','" + tbproduct_price.Text + "'";
            SQL += ",'" + tbproduct_in_stock.Text + "','" + tbproduct_re_order.Text + "')";

            OleDbCommand cmdInsert = new OleDbCommand(SQL, conn);
            cmdInsert.ExecuteNonQuery();   ------------------------------------มันติดตรงนี้-----------------------------

            SQL = "select*from tbl_product order by product_id";

            OleDbCommand selectCMD = new OleDbCommand(SQL, conn);

            OleDbDataAdapter productDA = new OleDbDataAdapter();
            productDA.SelectCommand = selectCMD;

            DataSet productDS = new DataSet();
            productDA.Fill(productDS, "product");
            data.DataSource = productDS;
            data.DataMember = "product";
        }