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Opening a visualforce page from normal apex class or from Trigger please help me

HI Everyone,

I wish to display a message like "You are not allowed to edit the Close Date" in opportunity object while updating an opportunity record useing standard UI (not Visualforce page). So I want to open a visualforce page from trigger or normal apex class.


Please help me.


Thanks & Regards,


Shailesh DeshpandeShailesh Deshpande
You an simply use validation rules instead of using apex class or a trigger.