Incorrect syntax near 'Product_code' ช่วยดูให้หน่อยคะ พลาดตรงไหน หาไม่เจอคะ

            sb.Remove(0, sb.Length);
            sb.Append("SELECT Product_code,Product_name,Product_pricep,Product_pricem");
            sb.Append("FROM Product");
            sb.Append("WHERE ( Product_code =@Product_code )");

            string sqlProduct = sb.ToString();

            
            DataTable dt;
            com.CommandType = CommandType.Text;
            com.CommandText = sqlProduct;
            com.Parameters.Clear();  
            com.Parameters.Add("@Product_code", SqlDbType.NVarChar).Value =textBoxcodeproduct.Text;
            com.Connection = Conn;      
            dr = com.ExecuteReader();         
            if (dr.HasRows)
                {
                   dt = new DataTable();
                   dt.Load(dr);
                   textBoxcodeproduct.Text = dt.Rows[0]["Product_code"].ToString();
                   label7.Text = dt.Rows[0]["Product_name"].ToString();
                   label8.Text = dt.Rows[0]["Product_pricep"].ToString();
                   label9.Text = dt.Rows[0]["Product_pricem"].ToString();

     

                }