AsyncFileUpload ClientUploadError event in asp.net ajax

Ajax AsyncFileUpload OnClientUploadError
UsingOnClientUploadError.aspx

<%@ Page Language="C#" AutoEventWireup="true" %>

<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %>

<!DOCTYPE html>
<script runat="server">
    protected void AsyncFileUpload1_UploadComplete(object sender, AjaxControlToolkit.AsyncFileUploadEventArgs e)
    {
        string filePath = Request.PhysicalApplicationPath+ "Upload\\" + AsyncFileUpload1.PostedFile.FileName;
        AsyncFileUpload1.SaveAs(filePath);
    }    
</script>
<script type="text/javascript">
    function showConfirmation() {
        document.getElementById('Span1').innerText = 'upload complete.';
    }
    function showUploadError(sender,args) {
        document.getElementById('Span1').innerText = args.get_errorMessage();
    }
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>Ajax AsyncFileUpload OnClientUploadError  - How to use OnClientUploadError</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <h2 style="color:DarkBlue; font-style:italic;">Ajax AsyncFileUpload Example: How To Use OnClientUploadError</h2>
        <hr width="675" align="left" color="SkyBlue" />
        <asp:ScriptManager 
            ID="ScriptManager1"
            runat="server"
            >
        </asp:ScriptManager>
        <br />
        <cc1:AsyncFileUpload 
            ID="AsyncFileUpload1" 
            runat="server" 
            OnUploadedComplete="AsyncFileUpload1_UploadComplete"
            OnClientUploadComplete="showConfirmation"
            OnClientUploadError="showUploadError"
            CompleteBackColor="Pink"
            UploaderStyle="Traditional"
            BackColor="DarkSeaGreen"
            UploadingBackColor="Yellow"
            />
        <br />
        <span 
            id="Span1" 
            runat="server"
            style="color:Red; font-size:X-large; font-style:italic; font-weight:bold;"
            >
        </span>
    </div>
    </form>
</body>
</html>
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