function readOnly(count){ }
Starting November 20, the site will be set to read-only. On December 4, 2023,
forum discussions will move to the Trailblazer Community.
+ Start a Discussion
jagdish nikam 9jagdish nikam 9 

controller extension scenario

Hi All,

Could you please give me 2 scenario with examples which explain when should we use custom controller and controller extension?
SandhyaSandhya (Salesforce Developers) 

A custom controller is an Apex class that implements all of the logic for a page without leveraging a standard controller.
Use custom controllers when you want your Visualforce page to run entirely in system mode, which does not enforce the permissions and field-level security of the current user.

A controller extension is an Apex class that extends the functionality of a standard or custom controller.
 Use controller extensions when:
You want to leverage the built-in functionality of a standard controller but override one or more actions, such as edit, view, save, or delete.
You want to add new actions.
You want to build a Visualforce page that respects user permissions.

Please refer below link for sample code.
Hope this helps you!

If this helps you, please mark it as solved.

Thanks and Regards