Cursor click outside form boundary

I have a form displayed in my app and what I want to do is detect when the user clicks outside of the form and close it, however I am not sure how to do this?

Thanks

Simon

I think you can get the form rectangle, and check if the click it's inside the rectangle, if not just close it...

Sample:

vb.net Code:

Public Class Form1
    Private WithEvents tmr As New Timer
    Private Sub Form2_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        With tmr
            .Interval = 100
            .Start()
        End With
    End Sub
 
    Private Sub tmr_Tick(ByVal sender As Object, ByVal e As System.EventArgs) Handles tmr.Tick
        Dim ptIni As Point = Me.PointToScreen(New Point(0, 0))
        Dim ptTam As Point = Me.PointToScreen(New Point(Me.Size))
        If MouseButtons = Windows.Forms.MouseButtons.Left Then
            Dim rec As New Rectangle(ptIni.X, ptIni.Y, ptTam.X, ptTam.Y)
            If Not rec.Contains(MousePosition) Then
                Me.Close()
            End If
        End If
    End Sub
End Class