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Heena.Heena. 

what will be the flow of execution when we have multiple extensions

NagendraNagendra (Salesforce Developers) 
Hi Heena,

Extension controllers extend the properties and methods of either standard controller or custom controller. So if you have multiple extensions, they can access properties and methods of standard or custom controller it extends not the other extension's properties and methods in the order in which they are declared.

For more information please check with below links which will give you a clear picture. Hope this helps.

Kindly mark this as solved if the reply was helpful.

Thanks,
Nagendra
Heena.Heena.
hello sir