how to end the process when i close my window

[Zeuz]

Public Class Form1
 
    Private Sub Form1_FormClosing(ByVal sender As Object, ByVal e As System.Windows.Forms.FormClosingEventArgs) Handles Me.FormClosing
        Form1.Close()
        Form2.Close()
        Form3.Close()
        Form4.Close()
'Your other forms.'
    End Sub
End Class