Thank you for your suggestion and the code. Yes, my problem was that I missed entering the pound sign when specifying the ClientID name.

>You should check what the name of that form field really is. If you're using Web Forms and the control is in a container, it'll by something like Ctl1_txtMyTextBox or something along those lines.
>
>Use your DevTools of choice and Inspect Element to find out what hte real ID is then use that name instead.
>
>

>$("#Ctl1_txtMyTextBox").change(...);
>

>
>FWIW, in the past I've used a function that helps me with this:
>
>

>$$ = function (id, context) {
>        /// <summary>
>        /// Searches for an ID based on ASP.NET naming container syntax.
>        /// First search by ID as is, then uses attribute based lookup.
>        /// Works only on single elements - not list items in enumerated
>        /// containers.
>        /// </summary>    
>        /// <param name="id" type="var">Element ID to look up</param>    
>        /// <param name="context" type="var">
>        /// </param>    
>        /// <returns type="" /> 
>        var el = $("#" + id, context);
>        if (el.length < 1)
>            el = $("[id$=_" + id + "],[id*=" + id + "_]", context);
>        return el;
>    };
>

>
>You can then use it like this:
>

>$$("txtMyTextBox").change(function() { alert('exit') });
>

>
>and it'll find anything that matches this name regardless of the WebForms container prefixes.
>
>+++ Rick ---
>
>>I am trying to incorporate a jQuery Change function in an asp.net page that would make certain control invisible when user starts typing (making changes) in a text box. My initial test, just to call an alert() does not seem to work. Here is my code:
>>
>>

>><script type="text/javascript">
>>       $(document).ready(function () {
>>
>>           $("txtMyTextbox").change(function () {
>>
>>               alert("Change Function Called");
>>
>>           });
>>
>>   })
>></script>
>>

>>
>>What is wrong with my code? TIA