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nareshnaresh 

how many extension controller can we extend in standard and custom controller.

Karamala DamodarKaramala Damodar
hello naresh 
see the difference standardcontroller           customcontroller           extensions

we can use standardcontroller and 0 or more number of extensions like extensions="f.g,h" like this the way its calling is from left to right
we can use customcontroller and 0 or more number of extensions
but we cannot use standardcontroller and customcontroller as the same time
if its helps u then like this