Conditional Multiple Fields Searching and Filtering in LINQ

Question

Assuming that we have the following table:

Person:
  PersonID,
  Name,
  Age,
  Gender

And we are providing a search function that allows u

Answer 1

why not use the null coalescing operator? eg.

var products = from a in context.products where a.ID == (productID ?? a.ID) select a;

This works really well on my system