Answer Posted / ziya

Callback : It is a way to send a request to the web page
from the client script. Postback is an expensive call with
processing overhead. In callback a client function sends a
request and a special marked method is invoked on the
server. It does the processing & returns the value which is
received by another client function to process the result.
To have client side callbacks, the page has to implement
ICallbackEventHandler & implement functions
RaiseCallBackEvent & GetCallBackResult.

PostBack: Postback is the event which sends the form data to
the server. The server processes the data & sends it back to
the browser. The page goes through its full life cycle & is
rendered on the browser. It can be triggered by using the
server controls.

Describe the sequence of action takes place on the server when ASP.NET application starts first time?

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If you have an application with multiple security levels though secure login and my ASP.NET web appplication is spanned across three web-servers by using round-robbin load balancing. Explain which is the best approach to maintain login-in state for the users?

598

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What is cross page posting in asp net?

530

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What is the typical session identifier?

572

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How long do session variables last?

530

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What is asp according to you?

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What happens if an ASP.NET server control with event-handling routines is missing from its definition?

595

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Please briefly explain the usage of global.asax?

532

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What is %20 in a url?

542

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What is a page life cycle?

567

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List the asp.net validation controls?

521

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Define page fragment caching?

517

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Which class is used to send an email message from an ASP.NET Web page?

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What is the size of Get method and how much data it can store?

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What is the basic purpose of the required field validator? How can you use a required field validator to check that the user changes the initial value of a text box? a listbox?

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