Afzal Khan was telling us:
Afzal Khan nous racontait que :

This is a VBA group.

You should try to get it going using VBA.
Come back with specific question regarding VBA to help you build the
program.

'_______________________________________
See the follwong code to get you going
Dim revCheck As Revision
Dim strTextRev As String

Set revCheck = Selection.NextRevision
If Not (revCheck Is Nothing) Then
   Select Case revCheck.Type
       Case wdRevisionDelete, wdRevisionInsert, wdRevisionReplace
           'Do something with the text, like
           strTextRev = strTextRev & revCheck.Range.Text & "|"
   End Select
End If
'_______________________________________

Then, when you have something working in VBA, you can port it to C#, maybe
posting in a C# group for help.