Execute code when closing program TaskManager Process

Question

How do I as a person is to "TaskManager> Process" and "End Process", it closes another program along with it, so close the two programs together.

I tried following

Private Sub frmAH_FormClosing(sender As Object, e As FormClosingEventArgs) Handles MyBase.FormClosing
    If e.CloseReason = CloseReason.UserClosing Then
        Dim pProcess() As Process = System.Diagnostics.Process.GetProcessesByName("CabalMain")
        For Each p As Process In pProcess
            p.Kill()
        Next
        End
    End If
End Sub

However, it does not close when you close the game GameGuard, wanted closes the game together.