Compare Text Files

[Hutty]

I'm trying to compare two text files and have the difference displayed.
The code below displays both text files, just haven't figured out how to get what's not in either file.

FileOpen(1, File1.Value, OpenMode.Input, OpenAccess.Read, OpenShare.Shared)
FileOpen(2, File2.Value, OpenMode.Input, OpenAccess.Read, OpenShare.Shared)
Do While Not EOF(1)
Dim TextLine As String = LineInput(1)
Response.Write(TextLine)
Response.Write("<br>")
Loop
FileClose(1)

Do While Not EOF(2)
Dim TextLine2 As String = LineInput(2)
Response.Write(Textline2)
Response.Write("<br>")
Loop
FileClose(2)

Or if you have a better way of comparing two text files I'm open. I'm using vb.net and running a web form.
Thanks