Cancelling previous thread

[machado]

Greetings.
I have a program in VB2008 and I need to execute a thread from differents Subs.
Each time I start the thread I want to cancel the previous.
Here an example:

Private Sub TextBox_Changed(ByVal sender As System.Object, ByVal e As System.EventArgs)
           Dim ThreadResults As New Thread(AddressOf ShowResults)
           ThreadResults.Start()
End Sub


Private Sub ckBoxAllRecords_CheckedChanged(ByVal sender As Object, ByVal e As System.EventArgs)
           Dim ThreadResults As New Thread(AddressOf ShowResults)
           ThreadResults.Start()
End Sub

I write in a textbox, TextBox_Changed fires, thread spend 4 minutes filling a dataset
I check a checkbox, ckBoxAllRecords _CheckedChanged fires, thread spend 10 seconds filling a dataset.
I dont want anymore the dataset of TextBox_Changed so I want to cancel its filling.
It is possible to do?
Thanks in advance for any reply

[Plater]

If you have an object reference to the Thread you could call the Abort() function, I believe that is frowned upon though. In favor of changing some boolean variable that tells the thread to exit itself.

[machado]

Thanks for your help.
I resolved my problem creating a thread array.

        Private ThreadResults(4) As Thread
.
.
        CancelThreads()
        ThreadResults(0) = New Thread(AddressOf Me.ShowResults)
        ThreadResults(0).Start()
.
.
Private Sub CancelThreads()
        For i = 0 To UBound(ThreadResults)
            Try
                If ThreadResults(i).IsAlive Then
                    ThreadResults(i).Abort()
                End If
            Catch
            End Try
        Next
 End Sub