Can any one let me know the treatment methods for online gambling addiction ?

Throw your computer away.

I don't think there's such a thing as 'treatment' for gambling addiction any more than the ability to be mindful of your situation and when you need to stop. That's a skill in itself you need to understand.

If you have a network around you, make them aware of your situation and use them. Provide them with your account details and ask them to change them for you. Take some time away from computers and smartphones if you can too.

The first and arguably hardest step is admitting that you may need help. Because that's a pride thing and you feel like a failure/let down and that's not the case. Don't be afraid to open up to people - in fact, it might be that by opening up, you discover that you're not actually addicted, but you're using online gambling as a release from a stress you're under.

Talk, talk... talk and talk some more.