How to unlock a thread within lock brackets

Question

I am trying to convert this C++ code into a C#:

do{
    if (Node->NextNode == NULL) WaitForSingleObject(pThis->_Event, INFINITE);
    _critSect.Lock();
    if (Node->NextNode == NULL && !bRunning ) 
    {
        _critSect.Unlock(); // can explicitly unlock here
        break;
    }
    _critSect.Unlock();
}while (Node->NextNode == NULL);

In C++, I can explicitly unlock the thread, but C# only has a bracket. How can I add the "unlock" function in the code below before breaking?

do{
   if (Node->NextNode == null) DataQueueEvent.WaitOne();
   lock (thisLock)
   {
      if (Node->NextNode == null && !bRunning)
      // need to unlock here!!!                      
      break;
   }
} while (Node->NextNode == null);

Answer 1

It's simply unnecessary. in C# the lock statement translates into a try/finally, so the lock will be released whenever you exit the block regardless of how you exit the block, so there's no need to explicitly release the lock when you exit using the break path.