RE: Check Username Availability in ASP.Net using AJAX PageMethods

The error  Attribute 'onkeyup' in not a valid attribute of element in textbox. you can ignore as it is a warning.

Secondly for Error Occured message you ned to check and debug code

Hello!

I have tried your code.. but there is error..

Microsoft JScript runtime error: Unable to get value of the property 'value': object is null or undefined

however, i already type a username name inside the textbox.

I would suggest download the sample code from the site and try it

I have tried it but there is no output..

when i debug it..

there is no error, no warnings but 1 message saying that 'onkeyup' is not a valid attribute of element

is it because i use Visual Studio 2010 and ASP.NET 4.0 ??

I already told long back that you can ignore the warning "'onkeyup' is not a valid attribute of element"

Is the web method even being called? Have you placed breakpoint in code?

Or finally i would say download sample code. You don't even do that