Do I need to call Close() on a ManualResetEvent?

Question

I\'ve been reading up on .NET Threading and was working on some code that uses a ManualResetEvent. I have found lots of code samples on the internet. However, when reading

Answer 1

You'll notice the code

 using (var mre = new ManualResetEvent(false))
 {
    // Process the left child asynchronously
    ThreadPool.QueueUserWorkItem(delegate
    {
        Process(tree.Left, action);
        mre.Set();
    });

    // Process current node and right child synchronously
    action(tree.Data);
    Process(tree.Right, action);

    // Wait for the left child
    mre.WaitOne();
}

uses the 'using' keyword. This automatically calls the dispose method when finished even if the code throws an exception.