check userId availability

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I want to use Check UserId availability without refresh the form.
How can is solve this. Can i use ajax or any other procedure. Please providing the code for that. I used UserId field in the Sql server database and one textbox name txtUserId in my web page. I want if user leave from the textbox then it show a message userId is available or not.

Please help..i can't do it.

Thanks in advance

Posted 23-May-11 23:19pm

rahul dev123

Updated 23-May-11 23:20pm

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Ankur^\m/ 24-May-11 6:07am

You have been told many a times. Why don't you use Google for such questions? These are very common requirements are millions of examples are available on the web. :doh:

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Sandeep Mewara · Answer 1 · 2011-05-24T00:22:00

Solution 2

All you want is to know how to talk to server from client side (Javascript).

There are few ways to interact with server side through client side(Javascript):
1. XMLHttpRequest[^]
2. Callback[^]
3. WebService call[^]
4. PageMethod[^]

Posted 24-May-11 0:22am

Sandeep Mewara

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raju melveetilpurayil 24-May-11 6:24am

yap: right call :) my 5

Ashishmau · Answer 2 · 2011-05-23T23:31:00

Solution 1

U have to use ajax for that.
U can use textbox Onblur event to call javascript.
For more info see this link

http://dotnetspidor.blogspot.com/2009/03/check-username-availability-using.html[^]

Posted 23-May-11 23:31pm

Ashishmau

raju melveetilpurayil · Answer 3 · 2011-05-24T00:26:00

Solution 3

also check this
Checking Username Availability[^]

Posted 24-May-11 0:26am

raju melveetilpurayil