VB - proper format for this IF statement Follow

Till today, I have gotten away with having a Single Line Expression for my "SetTrack" field. 

The expression was simply:

Format.NamedSubStrings("PMSetID").Value & " " & Format.NamedSubStrings("SetID").Value & "/" & Format.NamedSubStrings("TrackID")

However, I am now in need of making an adjustment.  It PMSetID and SetID are the same, Id like to continue down that path, but if different, id like to make an adjustment.  I cant quite figure out the format here. I have the following, any thoughts would be appreciated.

PM = Format.NamedSubStrings("PMSetID").Value
SET = Format.NamedSubStrings("SetID").Value

If PM = SET
Format.NamedSubStrings("PMSetID").Value & " " & Format.NamedSubStrings("SetID").Value & "/" & Format.NamedSubStrings("TrackID")

Else
Format.NamedSubStrings("PMSetID").Value & " " & Format.NamedSubStrings("TrackID")

end if