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MammuMammu 

Why custom controllers was provided by salesforce if we can achieve same funtionality with standard controller and extensions?

Why custom controllers was provided by salesforce if we can achieve same funtionality with standard controller and extensions?
kumar tanwarkumar tanwar
Hello Mammu ,
The standard controller is auto generated by SFDC for all objects.

Custom controllers are written by you and do what your code tells them to do.

Extention are used when we need standardcontroller and customController in our page also with extension we used Multiple Controller in page..

Please see below link for more detail.
http://www.infallibletechie.com/2012/11/difference-between-standardcontroller.html