Deployed custom Timer Job to SharePoint application points to old build while running Job.

Hi All,

    Recently I have created a SharePoint Timer Job which will modify the list items based on the conditions. While deploying Timer Job first time from Visual Studio or PowerShell with .wsp file, it works fine. After that if I modify some and deploy again, it shows as deployed. But while running job it executes last initially deployed code only.

   To overcome this issue, I found in some anonymous site which says restart "SharePoint Timer" service in windows services.. This solution is resolving the problem. But is this correct way?