title: Any way to SQLBulkCopy "insert or update if exists"?
body: <p>I need to update a very large table periodically and SQLBulkCopy is perfect for that, only that I have a 2-columns index that prevents duplicates. Is there a way to use SQLBulkCopy as "insert or update if exists"? </p>
  
  <p>If not, what is the most efficient way of doing so? Again, I am talking about a table with millions of records. </p>
  
  <p>Thank you</p>