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i am developing online examination system in that i want to display time in countdown seconds
please send me the code
thanking u sir

You can use a JavaScript timer to do that.

You can also use the response header to set a refresh interval:
Response.AddHeader("Refresh", 1)
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How about googling "ASP.Net timer". The first result is a pretty good description of an AJAX timer.
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or else u can use ajax timer control to do tat
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Use SetInterval("callServer()", 1000);

From inside the callServer method, call the server and update the server countdown time. Also dont forget to update the time shown in the client control as well.
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