I have 2 lists of AccountNumbers. I am looking for duplicate product numbers across all the accounts. Here are my 2 lists and a little summary of what I am doing:
I loop through first list comparing to all in the second list. Problem I have is...say I find a duplicate in Account 1 and 2...then I also get the same record when on Account 2 and comparing to Account 1.
Do you have any ideas on hos I can better do this compare to eliminate the extra records?