public void fillMatrix( 
   Product productObj 
)

class MyPage : System.Web.UI.Page
{
    public string ProductPriceMatrix(Product objProduct)
    {
        System.Text.StringBuilder sb = new System.Text.StringBuilder();

        if (Base.HasAccess("eCom_Pricing", "") | Base.HasAccess("eCom_PricingExtended", ""))
        {
            Dynamicweb.eCommerce.Prices.PriceMatrix pm = new Dynamicweb.eCommerce.Prices.PriceMatrix();
            pm.fillMatrix(objProduct);

            //###################################
            //PRICE MATRIX
            //###################################
            sb.Append("<table border=0 cellpadding=0 cellspacing=0 width='95' style='width;' id=MatrixSchema style='display:;'>");
            sb.Append("<tr><td>");
            sb.Append("<fieldset style='width:100%;margin:5px;'><legend class=gbTitle>" + Translate.Translate("Priser") + "</legend>");
            sb.Append(pm.writeMatrix());
            sb.Append("</fieldset><br><br>");
            sb.Append("</td></tr>");
            sb.Append("</table>");
            sb.Append("<br></center>");

            sb.Append("<input type=hidden name=SavePriceMatrix value=1>");
        }

        return sb.ToString();
    }
}