How to stop process thats running inside private sub by clicking on cmdbutton?

The problem is:

I have private sub and inside that sub there isa code which access multiple files and make some operations on them, (renaming, compressing etc...)
I would like to give the user possibility to stop the process by clicking on the command button and poping out the message box vbyesno and if yes then exit sub.
I tried with Do While, but when i click the Command button program freeze. (CTRL+BREAK is the only thing that can stop program)

Any idea would be very welcomed!

I am sorry for my english but it's not my native language :)
Who is Participating?
Carl TawnConnect With a Mentor Systems and Integration DeveloperCommented:
You need two things.

1)  You need a DoEvents inside your loop otherwise the click on the button won't be processed.

2) You need a boolean flag, delcared in the General Declarations section of your form, to control processing.

The general precess is something like:

    Private m_bProcess As Boolean      '// In general declarations section

    Private Sub cmdCancel_Click()

        If Msgbox("Do you want to cancel ?", vbYesNo) = vbYes Then
            m_bProcess = False     '// Set flag to stop processing
        End If

    End Sub

    Private Sub YourMainProcessingLoop()

        m_bProcess = True         '// Default value

        Do While SomeCondition

              DoEvents       '// Need this so user can actually click "cancel" button

              '// Check for user having cancelled
              If Not m_bProcess Then Exit Do

              '//   User hasn't cancelled so do some stuff

    End Sub

Hope this helps.
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