how to apply keyboard events in Asp.net for textbox

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how can i apply keyboard event in asp.net c#....
for example

if i entered in textbox employee id
then its name should be fetched from db and displayed in next textbox.

can i do that???

Posted 31-Oct-12 20:31pm

sumit kausalye

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Sergey Alexandrovich Kryukov 1-Nov-12 2:41am

What exactly do you mean by "applying an event"? Handle event? Then what do you mean by "entered"? On each key press or what? After all, read the section Events of the TextBox control you use, in MDSN help page. What's the problem?
--SA

sumit kausalye 1-Nov-12 3:11am

sir actually i want
when i enter employee id in a text then it automatically fetch the employee id from database and the name of employee should be displayed in next textbox without button click so which keyboard event should i used and how in asp.net c#???

Sergey Alexandrovich Kryukov 1-Nov-12 3:47am

Apparently, "without button" means on each key press, so the event is... TextChanged.
--SA

sumit kausalye 1-Nov-12 3:56am

on keyup sir i mean when i finish enter employee id and when i clicked on name textbox that time it should show me the name from the database

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Sergey Alexandrovich Kryukov · Answer 1 · 2012-10-31T21:53:00

Please see my comments to the question. Apparently, be the reasons I explain, the event is System.Web.UI.WebControls.TextBox.TextChanged: http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.textbox.textchanged.aspx[^].

However, this is a bad idea: too many postbacks, bad for performance. It would be better to write JavaScript to do it all on the client side only. I would recommend using jQuery, a very robust and easy-to-use JavaScript library. This is the analog of this event, please see the code sample after the words "The event handler can be bound to the text input and the select box":
http://api.jquery.com/change/[^].

See also:
http://en.wikipedia.org/wiki/JQuery[^],
http://jquery.com/[^],
http://docs.jquery.com/How_jQuery_Works[^].

—SA