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sriganeshsriganesh 

why we are using constructor in controllers

why we are using constructor in controller

LVSLVS

The reason why we use constructors in any OO language - to initialize class variables and perform some basic computation. In case of controllers, we can use it run a query or calculate a value or if a particular field on the page has to be rendered or not and so forth.

 

Note that to make DML operations we need to use a method attached to the action attribute of the page - this is a salesforce restriction