ASP.NET Remain File Selection in Fileupload Control After Page PostBack

Hi,

Please refer below code.

HTML

<div>
    <asp:FileUpload ID="fu1" runat="server" />
    <asp:Button ID="btnUpload" Text="Upload" runat="server" OnClick="Upload" />
    <asp:Label ID="lblFileName" runat="server" />
    <br />
    <asp:Button Text="Postback" runat="server" />
</div>

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        Session["File"] = null;
    }
    else
    {
        if (Session["File"] != null)
        {
            HttpPostedFile file = (Session["File"] as HttpPostedFile);
            string FileName = file.FileName;
            lblFileName.Text = FileName;
        }
    }
}

protected void Upload(object sender, EventArgs e)
{
    if (fu1.HasFile)
    {
        Session["File"] = fu1.PostedFile;
        lblFileName.Text = fu1.PostedFile.FileName;
    }
    else
    {
        Session["File"] = null;
        lblFileName.Text = string.Empty;
    }

}

Screenshot