Public Class Form1

    Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
        Label1.Text = "Enabled"
    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Timer1.Enabled = Not Timer1.Enabled
        If Timer1.Enabled = False Then
            Label1.Text = "Disabled"
        End If
    End Sub
End Class