Clear FileUpload filename

We can do this using javascript. Please refer below code sample

<asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent">
<script type="text/javascript">
    function clearFileInputField(divId) {
        document.getElementById(divId).innerHTML = document.getElementById(tagId).innerHTML;
    }
</script>
    <asp:Label ID="Label1" runat="server"></asp:Label>
    <asp:UpdatePanel ID="UpdatePanel1" runat="server">
    <ContentTemplate>
        <div id="divFileUp3">
  <asp:FileUpload ID="fileUpload1" runat="server"   />
</div><asp:Button runat="server" Text="Remove" OnClientClick="clearFileInputField(divFileUp3)"/>
    </ContentTemplate>
    </asp:UpdatePanel>
</asp:Content>