[Resolved]Thread Pool Download Multiple Files at Once

[SCRN]

I'm trying to use the thread pool to download more than one string at a time. But most of the tutorial on threading is in C# or C++ so my knowledge on thread pool is limited.

Here's what I got so far.

Imports System.Threading
Imports System.Net
Imports System.Text.RegularExpressions

Public Class Example

    Private sLocation As String
    Private sName As String
    Private GameURL As String

    Private Sub Add()
        Dim dFile As New WebClient
        Dim FileStr As String
        FileStr = dFile.DownloadString(sLocation & sName)
        If Regex.IsMatch(FileStr, "(?<=<img src="")(.*?)(?="">)") = False Then Exit Sub
        ListBox1.Items.Add(sLocation & Regex.Match(FileStr, "(?<=<img src="")(.*?)(?="">)").Value)
    End Sub

    Private Sub Example_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        For Each FileLoc As String In IO.File.ReadAllLines(Application.StartupPath & "\Location.txt")
            For Each FileName As String In IO.File.ReadAllLines(Application.StartupPath & "\Name.txt")
                sLocation = FileLoc
                sName = FileName
                ThreadPool.QueueUserWorkItem(AddressOf Add)
            Next
        Next
    End Sub
End Class

I keep getting an error "Cross-thread operation not valid: Control 'Listbox1' accessed from a thread other than the thread it was created on." And it still seems to be downloading it one by one to me.