vb.net system.threading.thread ask the thread to cleanup and stop - vb.net

Question

I am new to vb.net multithreading, and I am facing a issue.
For threading I am using system.threading.thread function.
I know I can stop a thread using thread.abort call. But that's not a good choice (I have searched a bit and came to know that). This also will not work because my running threads needs some cleanup before cancellation.
So, I'm trying to do some kind of action that set a variable to UI thread like
dim bolStop as Boolean
So, if my UI thread set that Boolean value as true then all running thread can access/notice that change and can start cleanup process before stop/cancel the thread itself.
hope that makes sense...
best regards
Edit:1 (Source Is Pasted Here as Suggested By #DrunkenCodeMonkey
This is the code for Main Form (Form1.vb) (I think i need something here and also on the thread module (class) too) so, below i will paste module code too
Public Class Form1
Private objThreadList As ArrayList
Dim bolStop As Boolean
Private Sub cmd1_Click(sender As System.Object, e As System.EventArgs) Handles cmd1.Click
Dim intTLoop As Integer
sPrepareThreading()
For intTLoop = 1 To 5
sSendThread("", "Zakir", "Biplob")
Next
'sFinishThreading()
MessageBox.Show("Done!")
End Sub
Sub sPrepareThreading()
Dim intTLoop As Integer
objThreadList = New ArrayList
For intTLoop = 1 To 3
objThreadList.Add(Nothing)
Next intTLoop
End Sub
Sub sSendThread(strDraft As String, ByVal strTitle As String, ByVal strSubHeader As String)
Dim bolFalied As Boolean
Dim intTLoop As Integer
Dim objItem As System.Windows.Forms.ListViewItem
Dim objTData As objThreadCrossData
Dim objThreadClass As clsThread
Dim objNewThread As System.Threading.Thread
Zakir_RecheckThread:
My.Application.DoEvents()
If bolStop = True Then
Exit Sub
End If
bolFalied = True
For intTLoop = 1 To 3
bolFalied = True
If objThreadList(intTLoop - 1) Is Nothing Then
bolFalied = False
Else
If CType(objThreadList(intTLoop - 1), System.Threading.Thread).IsAlive = False Then
bolFalied = False
Else
bolFalied = True
End If
End If
If bolFalied = False Then
objTData = New objThreadCrossData
objTData.ID = ListView1.Items.Count
objTData.bolStop = False
objTData.strTime = DateTime.Now.ToString
objItem = ListView1.Items.Add(strTitle)
objItem.SubItems.Add(strSubHeader)
objItem = Nothing
objThreadClass = New clsThread(objTData, "", Me)
objNewThread = New System.Threading.Thread(AddressOf objThreadClass.StartThread)
objNewThread.IsBackground = True
objNewThread.Start()
objThreadList(intTLoop - 1) = objNewThread
Exit For
End If
Next
If bolFalied = True Then
GoTo Zakir_RecheckThread
Exit Sub
End If
End Sub
Public Sub ReceiveThreadMessage(ByVal objCrosData As Object)
Dim objTDataV1 As objThreadCrossData
objTDataV1 = CType(objCrosData, objThreadCrossData)
ListView1.Items(objTDataV1.ID).SubItems(1).Text = objTDataV1.strProgress
End Sub
Private Sub cmd2_Click(sender As System.Object, e As System.EventArgs) Handles cmd2.Click
REM This is where i like to stop the running thred either by setting bolStop = True and all running thead check that variable.
REM or by chate the thread (Thread Data Object Property naemd "bolStop" value"
REM please help me out...
End Sub
End Class
Code For Thread Module (clsThread.vb):
Public Class clsThread
Private m_Counter As Integer = 0
Private m_MainWindow As Form
Dim m_ThreadCrorssData As objThreadCrossData
Private Delegate Sub NotifyMainWindow(ByVal objCrosData As objThreadCrossData)
'We need an object of this deletegate
Private m_NotifyMainWindow As NotifyMainWindow
Public Sub New(ByVal objCrossData As Object, ByVal strXML As String, ByRef MainWindow As Form1)
m_MainWindow = MainWindow
m_ThreadCrorssData = CType(objCrossData, objThreadCrossData)
'We need to point our delegate to the Method, which we want to call from this thread
m_NotifyMainWindow = AddressOf MainWindow.ReceiveThreadMessage
End Sub
Public Sub StartThread()
While m_Counter < 100
m_Counter = m_Counter + 1
rem for example here i like to check for the value that whether user asked to stop
m_ThreadCrorssData.strProgress = CStr(m_Counter)
m_MainWindow.Invoke(m_NotifyMainWindow, m_ThreadCrorssData)
rem for example also here i like to check for the value that whether user asked to stop
'wait for some time before continuing loop
System.Threading.Thread.Sleep(1000)
End While
End Sub
End Class
Here is the Code For Module (Thread Object Data)
Module mdlCMM
Public Class objThreadCrossData
Property strProgress As String
Property bolStop As Boolean = False
Property strTime As String
Property ID As Integer
Property intStatusNum As Integer
Property strStatusValue As String
End Class
End Module