Textbox not updating after thread abort - vb.net

Question

I have a thread which is executing a sub and within a sub I am updating the textbox during a "Do while" loop is in progress. I then created a cancel button to abort the thread.
When the button is clicked then the thread is aborted but the textbox (Status_Txtbox.Text) doesn't get updated with the message "Parsing is terminated". I tried to do the debug and I see the code is executed perfectly and if condition for thread.isalive satisfies but not sure why the textbox doesn't get updated with the message.
Any idea how to update the textbox once thread is aborted ?
Dim thrd1 As Thread
Private Sub Parse_Btn_2G_Click(sender As Object, e As RoutedEventArgs) Handles Parse_Btn_2G.Click
Parse_Btn_2G.IsEnabled = False
Scan_Btn_2G.IsEnabled = False
cancel_Btn_2G.IsEnabled = True
Dim start As DateTime = DateTime.Now
Dim elapsedtime As Double
Dim action As Action
thrd1 = New Thread(Sub()
ButtonClickWork.DoWork()
action = Sub()
Status_Txtbox.Text = "Parsing Data, Please wait..."
End Sub
Me.Dispatcher.Invoke(action)
End Sub)
thrd1.Start()
elapsedtime = (DateTime.Now.Subtract(start).TotalSeconds) / 60
elapsedtime = Math.Round(elapsedtime, 2)
Status_Txtbox.Text = " Managed Objects in XML, total time elapsed is" & elapsedtime
End Sub
Private Sub Cancel_Btn_2G_Click(sender As Object, e As RoutedEventArgs) Handles cancel_Btn_2G.Click
Try
If cancel_Btn_2G.IsEnabled = True Then
If MsgBox("Do you really want to exit Parsing?", vbYesNo) = MsgBoxResult.Yes Then
Parse_Btn_2G.IsEnabled = True
Scan_Btn_2G.IsEnabled = True
cancel_Btn_2G.IsEnabled = False
thrd1.Abort()
thrd1.Join()
If thrd1.IsAlive = False Then
Status_Txtbox.Text = "Parsing is terminated"
End If
End If
End If
Catch ex As ThreadAbortException
Status_Txtbox.Text = "Parsing is terminated"
End Try
End Sub