How to upload image with progress bar in asp.net

Sub UpdateProgressBar(ByVal sender As Object, ByVal e As UploadProgressChangedEventArgs)

    If progressBar1.InvokeRequired Then

        progressBar1.Invoke(New UploadProgressChangedEventHandler(AddressOf UpdateProgressBar),sender, e)

        Exit Sub

    End If

    progressBar1.Value = CInt(progressBar1.Minimum + ((progressBar1.Maximum - progressBar1.Minimum) * e.ProgressPercentage) / 100)

End Sub

Private Sub btnUpload_Click( ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnUpload.Click

    Dim client As New System.Net.WebClient()

    AddHandler client.UploadProgressChanged, AddressOf UpdateProgressBar

    With client

        .Credentials = New NetworkCredential(     "MyFTPUsername", "MyFTPPassword")

        .UploadFile("ftp://webserverurl.com/public_html/test.zip", "C:\Users\Dreadypeetje\Downloads\test.zip")

    End With

End Sub