File Stream C#

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using System.Collections.Generic;
using System.Text;
using System.Xml.Serialization;
using System.IO;
namespace PDM.Data
{
    public class SerializerUtil
    {
        private static readonly XmlSerializer _serializer = new XmlSerializer(typeof(List));
        public static string SerializeList(List list)
        {
            using (var stream = new MemoryStream())
            {
                _serializer.Serialize(stream, list);
                stream.Position = 0;
                return Encoding.UTF8.GetString(stream.GetBuffer());
            }
        }
        public static List DesirializeList(string data)
        {
            if (string.IsNullOrEmpty(data))
                return null;
            using (var stream = new MemoryStream())
            {
                var bytes = Encoding.UTF8.GetBytes(data);
                stream.Write(bytes, 0, bytes.Length);
                stream.Position = 0;
                return (List)_serializer.Deserialize(stream);
            }
        }
    }
}