How to play the video without blocking the events using directshow

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C++

C

C#

MFC

Am trying to play the video with some of the basic controls included like play, pause and stop. If i use this code

if (SUCCEEDED(hr))
  {
      // Run the graph.
      hr = pControl->Run();
      if (SUCCEEDED(hr))
      {
          // Wait for completion.
          long evCode;
          pEvent->WaitForCompletion(INFINITE, &evCode);

          // Note: Do not use INFINITE in a real application, because it
          // can block indefinitely.
      }
  }

It waits for the video to complete so i cant pause the playing video.
so i used (responding to event)

#define WM_GRAPHNOTIFY  WM_APP + 1

IMediaEventEx *g_pEvent = NULL;
g_pGraph->QueryInterface(IID_IMediaEventEx, (void **)&g_pEvent);
g_pEvent->SetNotifyWindow((OAHWND)g_hwnd, WM_GRAPHNOTIFY, 0);

case WM_GRAPHNOTIFY:
    HandleGraphEvent();
    break;

void HandleGraphEvent()
{
    // Disregard if we don't have an IMediaEventEx pointer.
    if (g_pEvent == NULL)
    {
        return;
    }
    // Get all the events
    long evCode;
    LONG_PTR param1, param2;
    HRESULT hr;
    while (SUCCEEDED(g_pEvent->GetEvent(&evCode, ¶m1, ¶m2, 0)))
    {
        g_pEvent->FreeEventParams(evCode, param1, param2);
        switch (evCode)
        {
        case EC_COMPLETE:  // Fall through.
        case EC_USERABORT: // Fall through.
        case EC_ERRORABORT:
            CleanUp();
            PostQuitMessage(0);
            return;
        }
    } 
}

// Disable event notification before releasing the graph.
g_pEvent->SetNotifyWindow(NULL, 0, 0);
g_pEvent->Release();
g_pEvent = NULL;

I commented the waitforcompletion method, it executed sucessfully but the video was not played.

Your suggestions are welcome.