private static bool CompositeValuesEqual(EntityKey key1, EntityKey key2)
        {
            for (int i = 0; i < (int)key1._compositeKeyValues.Length; i++)
            {
                if (key1._keyNames[i].Equals(key2._keyNames[i]))
                {
                    if (!object.Equals(key1._compositeKeyValues[i], key2._compositeKeyValues[i]))
                    {
                        return false;
                    }
                }
                else if (!EntityKey.ValuesEqual(key1._keyNames[i], key1._compositeKeyValues[i], key2))
                {
                    return false;
                }
            }
            return true;
        }