public void AddOrderLine(OrderLine l) {
_OrderLines.Add(l);
SqlParameter[] SqlParams = new SqlParameter[]
{
    new SqlParameter("@orderId", _OrderId),
    new SqlParameter("@productId", l.ProductId),
    new SqlParameter("@productName", l.ProductName),
    new SqlParameter("@quantity", l.Quantity),
                new SqlParameter("@price", l.Price),
    new SqlParameter("@color", l.Color) <--- my addition
};

SqlHelper.ExecuteNonQuery(_dbdsn,CommandType.Text,
"insert into ecommerceOrderLines (orderId,productId,ProductName,quantity,price,color)" +
" values(@orderId,@productId,@ProductName,@quantity,@price,@color)",SqlParams);
Total += (l.Price * l.Quantity);
}