Web Service Call - Progress Bar with BackGroundWorker Not Working As Intended VB.NET

I am creating an application in VB.NET where users are able to attach XML via an OpenFileDialog and fire it at the Web Service.

I wish to have a progress bar at the bottom as at the moment, the GUI hangs and users think it has crashed while it is waiting for a response.

My code is below:

Private Sub Button3_Click(sender As Object, e As EventArgs) Handles Button3.Click

        BackgroundWorker1.RunWorkerAsync()

        If hubURLtxtbx.Text = "LIVE" Then
            XStreamLive()
        Else
            XStreamUAT()
        End If

    End Sub

    Private Sub My_BgWorker_DoWork(ByVal sender As Object, ByVal e As System.ComponentModel.DoWorkEventArgs) Handles BackgroundWorker1.DoWork

        For i As Integer = 0 To GlobalVariables.m_CountTo
            ' Has the background worker be told to stop?
            If BackgroundWorker1.CancellationPending Then
                ' Set Cancel to True
                e.Cancel = True
                Exit For
            End If
            System.Threading.Thread.Sleep(1000) ' Sleep for 1 Second
            ' Report The progress of the Background Worker.
            BackgroundWorker1.ReportProgress(CInt((i / GlobalVariables.m_CountTo) * 100))
        Next
    End Sub

    Private Sub BackgroundWorker1_ProgressChanged(ByVal sender As Object, _
 ByVal e As System.ComponentModel.ProgressChangedEventArgs) _
 Handles BackgroundWorker1.ProgressChanged

        If GlobalVariables.response = "" Then
            ProgBar.Value = e.ProgressPercentage
        Else
            ProgBar.Value = 100
        End If

    End Sub

    Private Sub BackgroundWorker1_RunWorkerCompleted(ByVal sender As Object, _
 ByVal e As System.ComponentModel.RunWorkerCompletedEventArgs) _
 Handles BackgroundWorker1.RunWorkerCompleted
        If e.Cancelled Then
            MsgBox("Cancelled")
        Else
            MsgBox("Completed")
        End If
    End Sub

    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click    
        ' Is the Background Worker do some work?
        If BackgroundWorker1.IsBusy Then
            'If it supports cancellation, Cancel It
            If BackgroundWorker1.WorkerSupportsCancellation Then
                ' Tell the Background Worker to stop working.
                BackgroundWorker1.CancelAsync()
            End If
        End If
    End Sub

Select allOpen in new window

Basically at the moment with the code as above the progress bar is updating AFTER I have received the XML response from the web service.

I want to have it so that the call is made and when the call is made the progress is updating, then when the call is successfully the bar is completely full?

Can anyone shed any light on this for me at all please?

On debug it appears the 'hanging' is when the XStreamUAT/XStreamLIVE Sub is called and it uses the Web Service Reference Client Object to send the XML to the Service.

Cheers,

James