Using statements are null-safe

suggest change

You don’t have to check the IDisposable object for null. using will not throw an exception and Dispose() will not be called:

DisposableObject TryOpenFile()
{
    return null;
}

// disposable is null here, but this does not throw an exception 
using (var disposable = TryOpenFile())
{
    // this will throw a NullReferenceException because disposable is null
    disposable.DoSomething(); 

    if(disposable != null)
    {
        // here we are safe because disposable has been checked for null
        disposable.DoSomething();
    }
}

Found a mistake? Have a question or improvement idea? Let me know.

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