in web application where defaultpage class object created. (specific point)

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C#

ASP.NET

my question is that when we make a console app or
Windows form there is always a method present that
call main method or entry point for application.
where we make an object of class and call method
of class.

now come to the point
1. web application where defaultpage class object created.
2. I would like to know specific point where object created
and which is responsible to make an object of defaultpage
class. is there any main method like console app



thanks in adavance ...!!