It's only couting the character to enter the textbox inasp.net

<script type="text/javascript">
    function Count(x) {
        document.getElementById("Label1").innerHTML = document.getElementById("TextBox2").value.length;
    }
</script>
<asp:TextBox ID="TextBox2" runat="server" Height="78px"
TextMode="MultiLine" Width="224px" onkeyup="Count(this.length)"
MaxLength="5" ViewStateMode="Enabled"></asp:TextBox>