triggering a while loop when button is clicked

hi,
i have a slight problem here.

i have a form with one start and one stop button. When you click the start button i want to execute a routine over and over again till the stop button is pressed.

i dont know how to do the while loop. should i put it in a function and trigger that on Buttonclick?
i hope you can help me out here!

VB Code:

Dim looping As Boolean
 
Private Sub cmdStart_Click()
looping = True
    If looping Then
        StartLoop
    End If
End Sub
 
Private Sub StartLoop()
While looping
    DoEvents    'So other things can still run ie stoping loop
Wend
End Sub
 
Private Sub cmdStop_Click()
looping = False
End Sub

thanks a bunch! i didnt know about DoEvents before! it solved the problem :)