Restrict user from entering unlimited characters in a multiline textbox

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

<script type="text/javascript" src="//"></script>
<script type="text/javascript">
    $(function () {
        $('#txtdesc').keypress(function (e) {
            var txt = $(this).val();
            if (txt.length > 90) {

Now add code in <body> tag ::

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


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