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N Hemanth kumarN Hemanth kumar 

what are the basic rules that we have to check before we invoke a method from visual force page?

Ajay K DubediAjay K Dubedi
hi N Hemanth,

Please try the link below.

https://developer.salesforce.com/docs/atlas.en-us.pages.meta/pages/pages_controller_methods.htm
https://salesforce.stackexchange.com/questions/204470/how-many-possible-ways-to-call-controllers-method-to-visual-force-page

Thanks,
Ajay Dubedi