protected string DisplayPrice(Northwind.ProductsRow product)
 {
     // If price is less than $20.00, return the price, highlighted
     if (!product.IsUnitPriceNull() && product.UnitPrice < 20)
         return string.Concat("<span class=\"AffordablePriceEmphasis\">", product.UnitPrice.ToString("C"), "</span>");
     else
         // Otherwise return the text, "Please call for a price quote"
         return "<span>Please call for a price quote</span>";
 }