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Disable button after 3 presses

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I thought this would be an easy one, but Im scratching my head.... Just need to allow the user 3 button presses before it becomes greyed out. Here is my code:

$PostponeButton_OnClick= 
{
[System.Windows.Forms.MessageBox]::Show("Number of clicks $NumberOfClicks", "Confirmation" , 0)
#TODO: Place custom script here
$NumberOfClicks = $NumberOfClicks++
[System.Windows.Forms.MessageBox]::Show("Number of clicks $NumberOfClicks", "Confirmation" , 0)
$TimeLeftMin = $TimeLeftMin + 20
$progressBar1.Maximum = ($progressBar1.Maximum + 1200)
If($NumberOfClicks -ge 2){
$PostponeButton.Enabled = $False
}
}

But the value of $NumberOfClicks remains at 0, despite clicking several times....



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