[2005] Need advice (Multi threading)

I recently start learning about multi threading. I'd want to know is my code right or wrong.

VB Code:

Public Class Form1
 
    Private Delegate Sub SetTextCallBack(ByVal val As Integer)
    Dim t As Threading.Thread
    Dim i As Integer = 0
 
    Private Sub SetText(ByVal val As Integer)
        If Me.Label1.InvokeRequired Then
            Dim d As New SetTextCallBack(AddressOf SetText)
 
            'I have used Me.Label1.begininvoke; Me.Label1.invoke; Me.begininvoke; Me.invoke
            'The result is same
            'The only difference is if doloop didn't sleep, begininvoke will stop responding
            'Me.BeginInvoke(d, val)
            Me.Invoke(d, val)
        Else
            Label1.Text = val
        End If
    End Sub
 
    Private Sub doLoop()
        While i < 10000
            If i > 9000 Then
                i = 0
            End If
 
            If i Mod 100 = 0 Then
                Me.SetText(i)
                Threading.Thread.Sleep(100)
            End If
 
            i += 1
        End While
 
        MessageBox.Show("Finished")
    End Sub
 
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        'Me.doLoop()
 
        t = New Threading.Thread(New Threading.ThreadStart(AddressOf doLoop))
        t.Start()
    End Sub
 
    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        't.Abort() 'I've read some article that I should not use this.
        'Me.Text = "Button2"
        i = 10000
        t.Join() 'Or use t=nothing
    End Sub
End Class

My question is: Does this code right? It seems that doloop procedure must sleep for a while if I want my UI thread keep responding.