VS 2005 Required On Getting Multiple Files Size

I need to get file size of some files, which i can get very easily by using FileInfo class.. As of now, I'm looping through all files in My Directory and then taking their file sized into a notepad.But the real problem for me is,Like this, I'm having around 100 Root directories, each contains ~ 1000 subdirectories and each sub directory contains ~ 80 files..Yes, I know, that, I can use a recursive function and loop through all dirs and sub dirs and thus the files.. which was taking huge efforts in terms of time.I want to know, If there was any other alternative, which will make my task more easier and efficient.