Will Dispose() be called in a using statement with a null object?

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Is it safe to use the using statement on a (potentially) null object?
Consider the following example:

class Test {
    IDisposable GetObject(string name) {
        // returns null if not found
    }

    void DoSomething() {
        using (IDisposable x = GetObject("invalid name")) {
            if (x != null) {
                 // etc...
            }
        }
    }
}

Is it guaranteed that Dispose will be called only if the object is not null, and I will not get a NullReferenceException?

5 Answers
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