Extendable textbox using jQuery

Extendable textbox using jQuery (Set Maximum length for multiline textbox)

Introduction:

Here we going to see how using the jquery we can extend the multiline textbox length.
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Description:

We know that the jQuery is the small pre written function using javascript, here I am using jquery1.9.1.js file as a script source.
To use a jquery source file, 
we need to declare the script type and source to give the path of the file.

<script type="text/javascript" src="http://code.jquery.com/jquery-1.9.1.js">

</script>

Above we declare the js source path now we need to open a script tag within that we have to gice our condition function supported by the source js file.

<script type="text/javascript">

here the source file function will be entered

</script>

$(function() 

{

 $('#txt_example').keypress(function(e) {

 var txt = $(this).val();

 if (txt.length > 50) {

 e.preventDefault();

 }

 });

 });

                                                              })

Now on the asp.net page put some asp control.

like

<asp:Textbox ID="txt_example" TextMode="MultiLine" runat="server" ></asp:TextBox>

Now whenever you type in the text box it will stretch upto its maximum value.

For any other clarification comment below.