Windows service not Working

Question

Hi ,
I  Copied Full code from My WIndows Application to Windows Server .
But I Dont Know how to Call My Method in OnStart Method in Windows Service.
I tried By Calling My Method Under On Start (string[] arg).
My Windows Application is working Perfectly , But Windows Service is  Not
working at all.
Any Help is Greatly Appreciated as per as possible.
 
Thanks & Regards,
Tirupati