System.Xml.XmlDictionaryString.EmptyStringDictionary.TryLookup C# (CSharp) Method

            public bool TryLookup(int key, out XmlDictionaryString result)
            {
                if (key == 0)
                {
                    result = _empty;
                    return true;
                }
                result = null;
                return false;
            }