DOT NET Interview Questions - DotNetSpider

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VaryByCustom:-Lets you customize the way the cache handles page variations
by declaring the attribute and overriding the GetVaryByCustomString handler.
VaryByControl:-Caches different versions of a user control based on
the value of properties of ASP objects in the control.
(A) How will implement Page Fragment Caching ?
Page fragment caching involves the caching of a fragment of the page, rather than the
entire page. When portions of the page need to be dynamically created for each user
request this is best method as compared to page caching.You can wrap Web Forms user
control and cache the control so that these portions of the page don’t need to be recreated
each time.
(B) What are ASP.NET session and compare ASP.NET session with
classic ASP session variables?
ASP.NET session caches per user session state.It basically uses “HttpSessionState” class.
Following are the limitations in classic ASP sessions :-
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ASP session state is dependent on IIS process very heavily.So if IIS restarts
ASP session variables are also recycled.ASP.NET session can be independent
of the hosting environment thus ASP.NET session can maintained even if IIS
reboots.
ASP session state has no inherent solution to work with Web Farms.ASP.NET
session can be stored in state server and SQL SERVER which can support
multiple server.
ASP session only functions when browser supports cookies.ASP.NET session
can be used with browser side cookies or independent of it.
(B) Which various modes of storing ASP.NET session ?
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InProc:- In this mode Session state is stored in the memory space of the
Aspnet_wp.exe process.This is the default setting.If the IIS reboots or web
application restarts then session state is lost.
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