private void CheckBox_PREVIEWSTART_CheckedChanged(object sender, EventArgs e) { KSJApiBase.KSJ_PreviewSetPos(m_nDeviceCurSel, PictureBox_PREVIEWWND.Handle, 0, 0, PictureBox_PREVIEWWND.Width, PictureBox_PREVIEWWND.Height); bool bCheck = CheckBox_PREVIEWSTART.Checked; KSJApiBase.KSJ_PreviewStart(m_nDeviceCurSel, (bCheck ? true : false)); if (bCheck) { Timer_GET_FRAME_RATE.Start(); } else { Timer_GET_FRAME_RATE.Stop(); } }