Tracking Excel Cell Changes using C# and .net 2.0

Question

Hai Friends::

             Am More  Exciting  Tracking Excel Changes.Am working on Calculating event is always fired before the Changing event, as if I have a range that contains both a formula cell andthe source data for that cell then when I update the source data cell and it will automatically update on the Formula data (cell also).Am use the Event in Excel Called.

There's the AppEvents_SheetCalculateEventHandler, but it's signature would
be simply:

private void Calculating(object Sh){...}

But I cant Get the Changes