[Solved] HTML5 File Size validation using JavaScript not working in IE9

Hello sir I have used below code  but its not working in ie..

then how to use it..

<script type="text/javascript">
       function checkfilesize(source, arguments) {
           arguments.IsValid = false;
           var size = document.getElementById("<%=fu1.ClientID%>").files[0].size;
           alert(size);
           if (size > 102400) {
               arguments.IsValid = false;
               return false;

           }
           else {

               arguments.IsValid = true;
               return true;

           }
       }

   </script>
   <asp:FileUpload ID="fu1" runat="server" />
     &nbsp; 
   <asp:CustomValidator ID="cvvalidate" runat="server" ToolTip="FileSize should not exceed 1MB"
       Style="color: #FF0000; display: inline; float: left; font-family: arial; font-size: 13px;
       margin-left: 100px; margin-top: 10px;" ValidationGroup="a" ErrorMessage="FileSize Exceeds the Limits."
       ControlToValidate="fu1" ClientValidationFunction="checkfilesize"></asp:CustomValidator>