title: Best way to compare two large string lists, using C# and LINQ?
body: <p>I have a large list (~ 110,000 strings), which I need to compare to a similar sized list.</p>
  
  <p>List A comes from 1 system.
  List B comes from a SQL table (I can only read, no stored procs, etc)</p>
  
  <p>What is the best way to find what values are in list A, that no longer exists in list B?</p>
  
  <p>Is 100,000 strings a large number to be handled in an array?</p>
  
  <p>thanks</p>