Join Datasets - Program To Catalog MP3s

I'm working on a program to catalog MP3s (I know, it's a tired thing that's been done to death), and want a better way to determine if a file has previously been added to my database. I have two datasets that are structurally identical. The first dataset is populated from the database and the second is populated via the application during the scan.

I then compare each record in the second dataset to the first with the following code:

Private Sub CompareDataSets(ByVal dsOriginal, ByVal dsNew)
Dim dv As DataView
Dim sFileName As String
Dim sPath As String
Dim bgFileSize As Long

[CODE]...

This method seems terribly inefficient and I'd much prefer being able to do a join of sorts off the two datasets and delete all records from the application populated dataset where there is a match.