public void paramKeyValue( 
   object obj,
   ref string key,
   ref object value 
)

class MyPage : System.Web.UI.Page
{
    private Dynamicweb.eCommerce.Prices.PriceMatrix price;

    private void Page_Load(System.Object sender, System.EventArgs e)
    {
        price = (Dynamicweb.eCommerce.Prices.PriceMatrix)Session["Ecom.Backend.PriceMatrix"];
    }

    public string writeMatrixDimension(SortedList Dimensions, int level, Hashtable Params, Hashtable CurrencyDefaultPrice)
    {
        System.Text.StringBuilder sb = new System.Text.StringBuilder();
        ICollection col = null;
        ICollection collection = null;

        col = (ICollection)Dimensions.GetValueList()[0];
        collection = price.getCollection(col);

        SortedList subDimensions = new SortedList();
        for (int i = 1; i <= Dimensions.Count - 1; i++)
        {
            subDimensions.Add(i, Dimensions.GetByIndex(i));
        }

        foreach (object obj in collection)
        {
            string key = string.Empty;
            object value = null;

            price.paramKeyValue(obj, ref key, ref value);
            Params.Add(key, value);

            Hashtable DefaultHash = new Hashtable();
            foreach (DictionaryEntry ItemCurr in CurrencyDefaultPrice)
            {
                DefaultHash[ItemCurr.Key] = ItemCurr.Value;
            }

            sb.Append(price.drawMatrixLine(obj, level, Params, CurrencyDefaultPrice));
            if (subDimensions.Count > 0)
            {
                sb.Append(writeMatrixDimension(subDimensions, level + 1, Params, CurrencyDefaultPrice));
            }

            CurrencyDefaultPrice.Clear();
            foreach (DictionaryEntry ItemReset in DefaultHash)
            {
                CurrencyDefaultPrice[ItemReset.Key] = ItemReset.Value;
            }

            Params.Remove(key);
        }
        return sb.ToString();
    }
}