vb detect mouse click

Hi, I neew to detect when user click outside my form.
I am using visualstudio 2015 vb.net
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Éric MoreauSenior .Net ConsultantCommented:
Maybe the Form's Deactivate event (https://msdn.microsoft.com/en-us/library/system.windows.forms.form.deactivate(v=vs.110).aspx) is what you are looking for?

What are you trying to achieve?
David Johnson, CD, MVPRetiredCommented:
It can be done but it means writing a routine that delves deep into the operating system.  Windows Forms are not designed to detect clicks outside of their space. It might be easier to check for focus changes
Mohamed AbowardaSenior Software EngineerCommented:
You can add a timer and use GetAsyncKeyState() windows API function inside the timer tick function.

<DllImport("user32.dll")> _
Shared Function GetAsyncKeyState(ByVal vKey As System.Windows.Forms.Keys) As Short
End Function

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Timer Tick:
If GetAsyncKeyState(Keys.LButton) <> 0 Then
    ' TODO: Add code here to handle left mouse click...
End If

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