Serialize list of Objects in XML

public static class SerializeUtil
    {
        public static string XmlSerialize<T>(List<T> sourceCollection)
        {
            XmlSerializer xmlSer = new XmlSerializer(typeof(List<T>));
            StringWriter textWriter = new StringWriter();
            xmlSer.Serialize(textWriter, sourceCollection);
            xmlSer = null;
            return textWriter.ToString();
        }
    }