How to rename and move files from one folder to other folder

Question

I want to generate files from one folder to another
lets say i have 3 files in one folder and i want to generate 20 000 files of each
let say abc_1.pdf,pqr_1.jpeg,xyz_1.txt i want to generate
abc_1.pdf,abc_2.pdf......................
pqr_1.pdf,pqr_2.pdf.........................
xyz_1.txt,xyz_2.txt...................
and all these 60000 file i want to move into another folder
How can we achieve this in VB.net console applications