int productID = 21; // This is a non-existant product ID.
decimal? price = null; // Initialize the price to a null value.
price = oc.Products.Where(p => p.ID == productID)
.Select(p => (decimal?)p.Price)
.FirstOrDefault();
// p.Price is defined as Decimal which would return 0 as the default value.
// The method FirstOrDefault would return a 0 if we didn’t
// cast p.Price to a “decimal?”

if (!price.HasValue)
{
// A product matching productID was not found.
}
else
{
// A product matching productID was found.
}

@Ron: Ha ha ha. That’s actually a compliment!