How to detect which button was clicked in code behind?

[dhemue1930]

I have three buttons each calling \[code\]btn_Clicked\[/code\] on their \[code\]onClick\[/code\] event. In code behind I want to get the ID of the button that caused postback. I know I can assign each button to call a different method but I would like to learn a bit of ASP.Net. Also tell me which method is more efficient? Calling different methods on different button clicks or calling the same method (if the functionality of each button is same).