Automatically pick urls in listbox then load to webbrowser

[Polas5]

My problem i have almost made the program which gives urls from google and collect in listbox and sort found as i typed links and copy into richtextbox.

But i need to pick up all urls from google automatically from all pages.
Because now it does only 1 page.

Here is the part of my code in which i want to make it work.

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        WebBrowser1.Navigate("http://www.google.co.zw/search?num=100&hl=en&lr=&biw=1152&bih=683&q=" & TextBox1.Text)
    End Sub

    Private Sub WebBrowser1_DocumentCompleted(ByVal sender As System.Object, ByVal e As System.Windows.Forms.WebBrowserDocumentCompletedEventArgs) Handles WebBrowser1.DocumentCompleted
        If (WebBrowser1.ReadyState = WebBrowserReadyState.Complete) Then
            For Each ClientControl As HtmlElement In WebBrowser1.Document.Links
                If Not ClientControl.GetAttribute("href").Contains("google") And ClientControl.GetAttribute("href").Contains("http") Then
                    ListBox1.Items.Add(ClientControl.GetAttribute("href"))
                End If
            Next
        End If
End sub

So the question would be how i can make it work automatically with my code using timer,multi threading or backgroundworker ?

here is that i want.


what i have this code but it does not pick urls automatically.
I have the code which is doing automatically but i need your help i have alot of great codes.
Ok what it gives me ?

First the code works great but the problem with it is not pick urls which i want because it gives me not those sites and links.
It just does only random urls.
So maybe if a good programmers can you help me fix it ?

Here it is:

Public Class Form1
    Private Event PageChecked()
    Private i As Integer = 1
    Private parameter As String

    Private Sub WebBrowser1_DocumentCompleted(ByVal sender As  System.Object, ByVal e As  System.Windows.Forms.WebBrowserDocumentCompletedEventArgs) Handles  WebBrowser1.DocumentCompleted

        If (WebBrowser1.ReadyState = WebBrowserReadyState.Complete) Then
            For Each ClientControl As HtmlElement In WebBrowser1.Document.Links
                Try
                    If Not  ClientControl.GetAttribute("href").Contains("google") And  ClientControl.GetAttribute("href").Contains("http") Then
                        ListBox1.Items.Add(ClientControl.GetAttribute("href"))
                    End If
                Catch ex As Exception

                End Try

            Next
        End If

        RaiseEvent PageChecked()

End Sub

Private Sub BackgroundWorker1_DoWork(ByVal sender As Object, ByVal e As  System.ComponentModel.DoWorkEventArgs) Handles BackgroundWorker1.DoWork
        Dim path As String = DirectCast(e.Argument, String)
        WebBrowser1.Navigate("http://www.google.lt/search?num=100&q=" & path & "&start=" & i * 200)
        BackgroundWorker1.ReportProgress(i)
    End Sub

    Private Sub pageIsChecked() Handles Me.PageChecked
        If i < 4 Then
            i += 1
            BackgroundWorker1.RunWorkerAsync(parameter)
        Else
          

End If
    End Sub