Upload multiple files

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C#

upload

I am trying to upload multiple files.. if user may upload 1 file then they may b go with submit button but if user wants to upload multiples files then they should click on upload more files and then next fileupload will be display how i do this.. i want to upload file separtely .. not want to select multiples at a time this is what i try

What I have tried:

 <div>


        <asp:FileUpload ID="FileUpload1" runat="server" />
        <asp:LinkButton ID="LinkButton1" runat="server">upload multiple files</asp:LinkButton>
   
    <br />
    <asp:Button ID="Button1" runat="server" Text="upload" OnClick="Button1_Click" />
    <br />
    <asp:Label ID="Span1" runat="server"></asp:Label>
</div>

protected void Button1_Click(object sender, EventArgs e)
       {
           if (FileUpload1.HasFiles)
           {
               foreach (HttpPostedFile uploadedFile in FileUpload1.PostedFiles)
               {
                   uploadedFile.SaveAs(System.IO.Path.Combine(Server.MapPath("~/Images/"),
                   uploadedFile.FileName));
                   Span1.Text += String.Format("{0}<br />", uploadedFile.FileName);
               }
           }