Hi all,
I just want to share some info here. Do I post at the right place? If not, pls forgive me.

Below is the link to an article about string in VB. Only after reading, I know vbNullString is better than "". After I implemented it in one of my macro, vbNullString cut execution time down by half and more!

Optimize string handling in Visual Basic
http://www.aivosto.com/vbtips/stringopt.html

Thanks.