VB.net BackgroundWorker Updating UI

[Bizzet]

Private _Proxies As New List(Of String)
    Private _Array As New List(Of String)
 
    Private Sub btnLeech_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Leech_btn.Click
        Worker.RunWorkerAsync(_Array)
    End Sub
 
    'Open a bunch of new threads to download sources of webpages
    Private Sub Fetch(ByVal sender As System.Object, _
                                     ByVal e As System.ComponentModel.DoWorkEventArgs) Handles Worker.DoWork
        Dim websiteUri As Uri = Nothing
        Dim Website As String
        For I = 0 To _Array.ToList.Count - 1
            Website = _Array(I)
            Using wc As Net.WebClient = New Net.WebClient
                AddHandler wc.DownloadStringCompleted, AddressOf SourceDownloaded
                If Uri.TryCreate(Website, UriKind.Absolute, websiteUri) Then
                    wc.DownloadStringAsync(New Uri(Website))
                    Threading.Thread.Sleep(250)
                Else
                    If Notify.Checked = True Then
                        TrayIcon.ShowBalloonTip(1, "Invalid website", "There was a invalid site in the list." & Website.ToString, ToolTipIcon.Error)
                        Me.TrashSite_list.Items.Add(Website)
                    Else
                        Me.TrashSite_list.Items.Add(Website)
                    End If
                End If
            End Using
        Next
    End Sub
    'Grab the proxies from the webpages
    Private Sub SourceDownloaded(ByVal sender As Object, ByVal e As Net.DownloadStringCompletedEventArgs)
        Dim strRegex As String = "\b(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\:[0-9]{1,5}\b"
        Dim myRegexOptions As RegexOptions = RegexOptions.None
        Dim myRegex As New Regex(strRegex, myRegexOptions)
        Dim frm As New Proxies
        Dim i As Integer
        My.Settings.Proxies = New StringCollection
        If e.Error Is Nothing Then
            For Each myMatch As Match In myRegex.Matches(e.Result)
                If myMatch.Success Then
                    Try
                        i += i
                        _Proxies.Add(myMatch.ToString)
                        Worker.ReportProgress(i)
                    Catch ex As WebException
                        MessageBox.Show(
                            ex.ToString,
                            ErrorToString,
                            Windows.Forms.MessageBoxButtons.OK)
                    End Try
                End If
            Next
        End If
    End Sub
 
    Private Sub Worker_ProgressChanged(sender As Object, e As System.ComponentModel.ProgressChangedEventArgs) Handles Worker.ProgressChanged
        Proxy_list.Items.AddRange(_Proxies.ToArray)
            Proxy2_lbl.Text = "Proxies: " & Proxy2_list.Items.Count
        Proxy_lbl.Text = "Proxies: " & Proxy2_list.Items.Count
    End Sub
 

This is my code and I want it to update the UI with it but I am unsure how to do so. I am looking for an example with commenting so I can understand it. So far I have posted on a few sites and everyone will tell me what to do or give me an example but nobody will tell me what to do with the example! They expect me to know what the code does, but If I knew what it did, do you really think I'd be asking questions? Anyways, back on topic:

This is what I am trying to accomplish. When I click Leech_btn, it starts my backgroundworker. The background worker downloads the string of a website from the list _Array and moves it over to SourceDownloaded to be filtered. (It removes all the proxies from the website) It then should display the proxies in Proxy_list but this is where I am having trouble. What should I do?

[PsychoCoder]

So what you're wanting is for someone to just do it for you, and add comments for you? Am I understanding you correctly? If not then please let me know :)

[Bizzet]

@PsychoCoder
No, I'm looking for someone to spend some actual time responding to my questions and explaining their reasoning and how I should more specifically go about it but I guess I can't expect that here. Especially when this is the first reply and your a mod. Ha.

[PsychoCoder]

@Bizzet you're absolutely right, I was having a hard day and took it out on you and for this I apologize. As for your code, did you write that code or was it copied from somewhere (not meant as an insult I promise), just trying to figure out what we can do to help.

Does that code do what you're looking for? If not what does it do versus what you're looking to accomplish?

[Bizzet]

Well it was, but I have modified it so much that it's not really the same code as the original source anymore. I believe the backgroundworker works as it is suppose to but my UI does get updated. It is suppose to be adding the proxies scraped from the website to my listbox, _Proxylist.

[Frinavale]

What kind of application are you developing?

If it's WPF, then you should be looking into using the Dispatcher class to update your UI with the stuff you retrieved in your threads.

If it's a win forms application, you'll have to put a sync lock around the code that updates the control and use the ListView.BeginInvoke method to do the updation.

-Frinny