need help with loop in search engine finder code

Ran into a problem. My for loop seems to stop after just for the task. I can't seem how to get it to continue on, I've used this type of loop many times and have never had this problem. Any suggestions?

Code:

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Imports System.Net
Imports System.Text.RegularExpressions
Public Class Form1
    Dim sites As String = Nothing
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
  ListBox1.Items.AddRange(TextBox1.Text.Split(Environment.NewLine))
  TextBox1.Clear()
    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
  BackgroundWorker1.RunWorkerAsync()
    End Sub
    Private Sub BackgroundWorker1_DoWork(ByVal sender As System.Object, ByVal e As System.ComponentModel.DoWorkEventArgs) Handles BackgroundWorker1.DoWork
  Dim pages As Integer = 1
  Dim p As Integer = 0
  Dim source As String
  For i = 0 To ListBox1.Items.Count - 1
    RichTextBox1.Text = RichTextBox1.Text + ListBox1.Items.Item(i)
    Do Until p = NumericUpDown1.Value
    Dim wc As New WebClient
    source = wc.DownloadString("http://www.bing.com/search?q=" & ListBox1.Items.Item(i) & "&go=&qs=n&sk=&sc=4-13&first=" & pages & "&FORM=PERE")
    sites = sites + source
    links(i)
    pages += 10
    p += 1
    Loop
    source = Nothing
  Next
    End Sub
    Private Sub links(ByVal i As Integer)
  Dim links As MatchCollection = Regex.Matches(sites, "(http|https):\/\/([\w\-_\.]+)+([\w\-\.,@?^=%&:/~\+#]*[\w\-\@?^=%&/~\+#])?", RegexOptions.Singleline + RegexOptions.IgnoreCase)
  For Each link As Match In links
    Dim value As String = link.Groups(0).Value
    If value.Contains(ListBox1.Items.Item(i)) Then
    RichTextBox1.Text = RichTextBox1.Text + value + vbNewLine
    End If
  Next
    End Sub
End Class

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At first glance it looks to me like, you need to reset 'p' to when you drop out of the 'Do Until loop'. On the Next 'For Loop' 'p' is already equal to NumericUpDown.Value and so won't perform the Do Until.

Where you have source = nothing, add on a new line p = 0 and see if that works


Cheers

Dan