C / C++ / MFC

// Global variable
CRITICAL_SECTION CriticalSection; 

void main()
{
    ...

    // Initialize the critical section one time only.
    InitializeCriticalSection(&CriticalSection); 

    ...

    // Release resources used by the critical section object.
    DeleteCriticalSection(&CriticalSection)
}

DWORD WINAPI ThreadProc( LPVOID lpParameter )
{
    ...

    // Request ownership of the critical section.
    __try 
    {
        EnterCriticalSection(&CriticalSection); 

        // Access the shared resource.
    }
    __finally 
    {
        // Release ownership of the critical section.
        LeaveCriticalSection(&CriticalSection);
    }

    ...

}

Somnath_Mali wrote:

It always returns "Network connected State".

case WM_COMMAND:
   if(LOWORD(wParam) == IDC_CHECKBOX1)
   {
      LRESULT ret = ::SendMessage((HWND)lParam, BM_GETCHECK, 0, 0);
   
      if (BST_CHECKED == ret)
      {
      }
      else if (BST_INDETERMINATE == ret)
      {
      }
      else  // must be BST_UNCHECKED
      {
      }
   }

Mark Salsbery
Microsoft MVP - Visual C++