Whats the best download method for vb?

I am trying to make a download client with ftp and im still trying to find out whats the best i have but im in stuck because i followed a guide but it only show how much its have downloaded in bytes, how can i change it to gb? and how can i add a download speed?

Code:

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Imports System.Net
Public Class MainForm

Private Sub MainForm_Load(sender As Object, e As EventArgs) Handles MyBase.Load
    Control.CheckForIllegalCrossThreadCalls = False
End Sub

Private Sub btnBrowseSave_Click(sender As Object, e As EventArgs) Handles btnBrowseSave.Click
    Dim newFolder As New FolderBrowserDialog
    If newFolder.ShowDialog = Windows.Forms.DialogResult.OK Then
        txtSavePath.Text = newFolder.SelectedPath
    End If
End Sub

Private Sub btnDownload_Click(sender As Object, e As EventArgs) Handles btnDownload.Click
    bWorker.RunWorkerAsync()
End Sub

Private Sub bWorker_DoWork(sender As Object, e As System.ComponentModel.DoWorkEventArgs) Handles bWorker.DoWork
    Dim buffer(1023) As Byte
    Dim bytesIn As Integer
    Dim totalBytesIn As Integer
    Dim output As IO.Stream
    Dim flLength As Integer
    Try
        Dim FTPRequest As FtpWebRequest = DirectCast(WebRequest.Create(txtFilePath.Text), FtpWebRequest)
        FTPRequest.Credentials = New NetworkCredential(txtFTPUsername.Text, txtFTPPassword.Text)
        FTPRequest.Method = Net.WebRequestMethods.Ftp.GetFileSize
        flLength = CInt(FTPRequest.GetResponse.ContentLength)
        lblFileSize.Text = flLength & " bytes"
    Catch ex As Exception

    End Try
    Try
        Dim FTPRequest As FtpWebRequest = DirectCast(WebRequest.Create(txtFilePath.Text), FtpWebRequest)
        FTPRequest.Credentials = New NetworkCredential(txtFTPUsername.Text, txtFTPPassword.Text)
        FTPRequest.Method = WebRequestMethods.Ftp.DownloadFile
        Dim stream As System.IO.Stream = FTPRequest.GetResponse.GetResponseStream
        Dim OutputFilePath As String = txtSavePath.Text & "\" & IO.Path.GetFileName(txtFilePath.Text)
        output = System.IO.File.Create(OutputFilePath)
        bytesIn = 1
        Do Until bytesIn < 1
            bytesIn = stream.Read(buffer, 0, 1024)
            If bytesIn > 0 Then
                output.Write(buffer, 0, bytesIn)
                totalBytesIn += bytesIn
                lblDownloadedBytes.Text = totalBytesIn.ToString & " bytes"
                If flLength > 0 Then
                    Dim perc As Integer = (totalBytesIn / flLength) * 100
                    bWorker.ReportProgress(perc)
                End If
            End If
        Loop
        output.Close()
        stream.Close()
    Catch ex As Exception
        MessageBox.Show(ex.Message)
    End Try
End Sub

Private Sub bWorker_ProgressChanged(sender As Object, e As System.ComponentModel.ProgressChangedEventArgs) Handles bWorker.ProgressChanged
    pBar.Value = e.ProgressPercentage
    lblPercent.Text = e.ProgressPercentage.ToString & "%"
End Sub

Private Sub bWorker_RunWorkerCompleted(sender As Object, e As System.ComponentModel.RunWorkerCompletedEventArgs) Handles bWorker.RunWorkerCompleted
    MsgBox("Download Complete!")
End Sub


End Class

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Control.CheckForIllegalCrossThreadCalls = False

dont ever use this, it makes it worse you are using the BGW that handles invoking for us.

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how can i change it to gb

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GB=Bytes / (1024^3)

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and how can i add a download speed?

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Speed=TotalBytesReceived/SecondsElapsed