Web side login with social networking side

Hi Friends,

I need help about social networking side with login my web side using asp.net c#

Specific like with Gmail, Facebook, twitter. All id validation with Gmail, Facebook, twitter database  

 How to configuration with code, when I enter Gmail id verified and login to permeation to go my web side and also stored id at my  Website save database.             

It is very urgent I need to implement my website……

Thanks an advance ………………