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if (DialogResult.OK == openFileDialog.ShowDialog())
            {
                CleanUp();

                m_objFilterGraph = new FilgraphManager();
                m_objFilterGraph.RenderFile(openFileDialog.FileName);

                m_objBasicAudio = m_objFilterGraph as IBasicAudio;
                
                try
                {
                    m_objVideoWindow = m_objFilterGraph as IVideoWindow;
                    m_objVideoWindow.Owner = (int) panel1.Handle;
                    m_objVideoWindow.WindowStyle = WS_CHILD | WS_CLIPCHILDREN;
                    m_objVideoWindow.SetWindowPosition(panel1.ClientRectangle.Left,
                        panel1.ClientRectangle.Top,
                        panel1.ClientRectangle.Width,
                        panel1.ClientRectangle.Height);
                }
                catch (Exception)
                {
                    m_objVideoWindow = null;
                }

                m_objMediaEvent = m_objFilterGraph as IMediaEvent;

                m_objMediaEventEx = m_objFilterGraph as IMediaEventEx;
                m_objMediaEventEx.SetNotifyWindow((int) this.Handle,WM_GRAPHNOTIFY, 0);

                m_objMediaPosition = m_objFilterGraph as IMediaPosition;

                m_objMediaControl = m_objFilterGraph as IMediaControl;

                this.Text = "DirectShow - [" + openFileDialog.FileName + "]";

                m_objMediaControl.Run();
                m_CurrentStatus = MediaStatus.Running;

                UpdateStatusBar();
                UpdateToolBar();
            }
        }

        private void CleanUp()
        {
            if (m_objMediaControl != null)
                m_objMediaControl.Stop();

            m_CurrentStatus = MediaStatus.Stopped;

            if (m_objMediaEventEx != null)
                m_objMediaEventEx.SetNotifyWindow(0, 0, 0);

            if (m_objVideoWindow != null)
            {
                m_objVideoWindow.Visible = 0;
                m_objVideoWindow.Owner = 0;
            }

            if (m_objMediaControl != null) m_objMediaControl = null;
            if (m_objMediaPosition != null) m_objMediaPosition = null;
            if (m_objMediaEventEx != null) m_objMediaEventEx = null;
            if (m_objMediaEvent != null) m_objMediaEvent = null;
            if (m_objVideoWindow != null) m_objVideoWindow = null;
            if (m_objBasicAudio != null) m_objBasicAudio = null;
            if (m_objFilterGraph != null) m_objFilterGraph = null;
        }

        private void menuItem4_Click(object sender, System.EventArgs e)
        {
            this.Close();
        }

        private void Form1_SizeChanged(object sender, System.EventArgs e)
        {
            if (m_objVideoWindow != null)
            {
                m_objVideoWindow.SetWindowPosition(panel1.ClientRectangle.Left,
                    panel1.ClientRectangle.Top,
                    panel1.ClientRectangle.Width,
                    panel1.ClientRectangle.Height);
            }
        }