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Joseph SukumarJoseph Sukumar 

How many maximum extensions we can refer in visual force?

PratikPratik (Salesforce Developers) 
Hi Joseph,

There is no as such limit for maximum number of extensions that you can refer in Visualforce page.

Here is the Salesforce documentation where you will find consideration for Custom Controller/Extensions. :  https://www.salesforce.com/us/developer/docs/pages/Content/pages_controller_considerations.htm

Thanks,
Pratik

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