This will show you the VB way:
http://www.cpearson.com/excel/vbe.htm

NickHK

"Folkien"
egroups.com...
I found the probleme, I have a macro in the document that modified the
cell I accesed and write the old value...

thx any way

I have know to find the way from C# to modify the macros of my excel
workbook, any one has an idea ? that would be great