Why isn't my thread doing anything? - vb.net

Question

I have the following code in a form called Fetch.vb:
Imports System.ComponentModel ' might not be needed?
Imports System.Threading
Public Class Fetch
Public Sub New()
InitializeComponent()
backgroundWorker1.WorkerReportsProgress = True
backgroundWorker1.WorkerSupportsCancellation = True
End Sub
Private Sub btnFetch_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnFetch.Click
Dim ctrl As Control
For Each ctrl In Me.Controls
If TypeName(ctrl) = "TextBox" Then
If ctrl.Text.Length = (Not 0) Then
tbList.Add(ctrl.Text)
MsgBox(tbList.Item(0).ToString)
Exit For
End If
End If
Next
' ProcessLinks()
btnFetch.Enabled = False
BackgroundWorker1.RunWorkerAsync()
End Sub
Public Sub backgroundWorker1_DoWork(ByVal sender As System.Object, ByVal e As System.ComponentModel.DoWorkEventArgs) Handles BackgroundWorker1.DoWork
AddHandler BackgroundWorker1.DoWork, AddressOf backgroundWorker1_DoWork
ProcessLinks()
End Sub
End Class
Now process links is a module with a public sub in with the code I am trying to run, I don't need any arguments passed to it, and it doesn't do anything that (I think) could affect this, I think I'm just doing the threading code wrong. I have backgroundworker1 in my fetch.vb form, and when I click btn Fetch, the program does nothing.
Any help and guidance or reading material would be greatly appreciated.
EDIT Here is my LinkProcess module.
Public Module LinkProcess
Private Sub backgroundWorker1_DoWork(ByVal sender As System.Object, ByVal e As System.ComponentModel.DoWorkEventArgs) Handles Fetch.BackgroundWorker1.DoWork
ProcessLinks()
End Sub
Public Sub ProcessLinks()
Dim tbContent As String
For Each tbContent In Fetch.tbList
Process.Start(tbContent)
Next
End Sub
End Module

Answer 1

What does your ProcessLinks() method do? Is it accessing any UI elements - like setting some text in label, or adding text a TextBox, etc.? If that is the case, then that won't work. You should not access the UI elements from inside your BackgroundWorker DoWork.
Here is a small post I wrote about how to use the BackgroundWorker correctly. This might help you.
http://www.vbforums.com/showthread.php?680130-Correct-way-to-use-the-BackgroundWorker