Timer2_Tick

 Private Sub Timer2_Tick(sender As System.Object, e As System.EventArgs) Handles   Timer2.Tick
        tb_now.Text = Now
        tb_Date.Text = Now.Date
        .....(略)
        '檢查checkBox有無打勾
        If CheckBox1.Checked = True Then
            tim1 = Now.TimeOfDay.TotalMinutes
            tim2 = cmb_hour.Text * 60 + cmb_min.Text
            If tim1 >= tim2 Then
                TextBox1.BackColor = Color.Red
                TextBox1.Text = "ON"
            Else
                TextBox1.BackColor = Color.AliceBlue
                TextBox1.Text = "OFF"
            End If
        End If
End Sub