Restrict user from entering unlimited characters in a multiline textbox

First of all add following code inside <head> tag ::

<script type="text/javascript" src="//code.jquery.com/jquery-1.10.2.js"></script>
<script type="text/javascript">
    $(function () {
        $('#txtdesc').keypress(function (e) {
            var txt = $(this).val();
            if (txt.length > 90) {
                e.preventDefault();
            }
        });
    });
</script>

Now add code in <body> tag ::

 <div>
       Enter Address(Should be Less than 90 Chars) <asp:TextBox ID="txtdesc" runat="server" TextMode="MultiLine"></asp:TextBox>
    </div>

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