It also makes me think that you're going to want to watch out for any use of
ActiveWorkbook or ActiveSheet or any 'Active' object, and go with
'ThisWorkbook' during definition/assignment of objects and actions.

"snoopydoopy" wrote:

On Apr 7, 12:47 pm, snoopydoopy wrote:
Using C# and Office Interop, I am opening 2 different copies of a
workbook (I manually copy workbook1.xls to workbook2.xls).Both
workbook1 and workbook2 have exactly same copies of the macros. From
the interop, I am calling macros in workbook1 and workbook2. I am
able to do this successfully but I am worried about 1 thing. At
different points in the macro, I call application.calculate and then
reset it back to manual. My worry is that the calculation settings in
one workbook would affect the processing of the other workbook.
Anybody can throw light on this?

I just realized that in the Macro, I am doing lot of copy paste. So
if there are multiple instances or excel running and each of them is
executing macros with lot of copy and paste commands then the result
is going to be very screwed up. So I need to write code which would
do cell by cell explicit copy.