Public Class Form1

    Private Sub btnStart_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnStart.Click
        For intMinutes As Integer = 0 To 5
            lblMinutes.Text = intMinutes.ToString
            For intSeconds As Integer = 0 To 60
                lblSeconds.Text = intSeconds.ToString
                Me.Refresh()
                System.Threading.Thread.Sleep(500)
            Next intSeconds
        Next intMinutes
    End Sub

    Private Sub btnExit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnExit.Click
        Me.Close()
    End Sub
End Class