Post and save files in asp.net 4.5

$("#<%=FileUpload1.ClientID %>").change(function () {<br />
                document.getElementById("form1").submit();<br />
                <%= ShowSelected() %>;<br />
            });

Public Function ShowSelected() As String
        Dim totalfiles As Integer = 0

        For Each postedFile As HttpPostedFile In FileUpload1.PostedFiles
            Dim fileName As String = System.IO.Path.GetFileName(postedFile.FileName)
            Session("selected") &= "<hr>" & postedFile.FileName & "</br>"
            Session("files") &= postedFile.FileName & vbCrLf
            lblPostedFiles.Text = Session("selected").ToString
            totalfiles += 1
        Next

        progressbar2.Attributes("max") = totalfiles * 10
        ProgressValue = totalfiles / 10
        Return ""
    End Function

Protected Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
        Dim count As Integer = 0
        For Each Filename As String In Request.Files
            Dim hFile As HttpPostedFile = TryCast(Request.Files(Filename), HttpPostedFile)

            'Dim f As HttpPostedFile = Request.Files(Filename)
            hFile.SaveAs(Server.MapPath("~/Uploads/") & Filename)
            lblUploaded.Text &= "<hr>" & Filename & "</br>"
            progressbar2.Attributes("value") += ProgressValue
            count += 1
        Next
        lblMsg.Text = String.Format("{0} files have been uploaded successfully.", count)
    End Sub