System.Xml.Serialization.XmlSerializationWriter.NextPrefix C# (CSharp) Method

        private string NextPrefix()
        {
            if (_usedPrefixes == null)
            {
                return _aliasBase + (++_tempNamespacePrefix);
            }
            while (_usedPrefixes.Contains(++_tempNamespacePrefix)) {; }
            return _aliasBase + _tempNamespacePrefix;
        }