Hello TARUN,

When you webForm is fulled with lots of controls and you contols perfom some
kind of server work.
It that case each time u are using your contol postback arise, and all form
with all controls in viewstate are sent to the server and returns back to
the client with new results - it's too rich and time consuming.
AJAX diminisfy the number of postback and amount of data transfered between
client and server by "target" call to get required info.

Read here http://en.wikipedia.org/wiki/AJAX

T> I need to ask one question .
T> I heard about ajax programing in web technology but i didn't
T> understand
T> the usage of that programming. I mean  to say there must be some
T> situation arise when we use ajax prgramming.
T> Can anyone tell me what should be the situation when it is suitable
T> to
T> use ajax programming .
T> Can u also suggest me the the sample code for that .
T> with regards
T> tarun sinha
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WBR,
Michael  Nemtsev :: blog: http://spaces.msn.com/laflour

"At times one remains faithful to a cause only because its opponents do not
cease to be insipid." (c) Friedrich Nietzsche