using System;

using System.Collections.Generic;

using System.IO;

using System.Xml.Serialization;

​

public static class Program

{

    public static void Main(string[] args)

    {

        var product = new Product

        {

            Id = "PROD-01111010",

            UserTypeId = "Product",

            Values = new List<object>

            {

                new Value {AttributeId = "ATTR-7196", Text = "201607280755"},

                new Value {AttributeId = "ATTR-6236", Text = "PTFE 125 + 25% GF, Platte"},

                new MultiValue

                {

                    Values = new List<Value>

                    {

                        new Value {Text = "PLATTE"},

                        new Value {Text = "LUBRIFLON 225"},

                        new Value {Text = "PLAQUE"},

                        new Value {Text = "LUBRIFLON 22"},

                    }

                }

            }

        };

​

        var s = new XmlSerializer(typeof(Product));

​

        using (var writer = new StringWriter())

        {

            s.Serialize(writer, product);

            Console.WriteLine(writer.ToString());

        }

    }

}

​

public class Product

{

    [XmlAttribute("ID")]

    public string Id { get; set; }

​

    [XmlAttribute("UserTypeID")]

    public string UserTypeId { get; set; }

​

    [XmlArray("Values")]

    [XmlArrayItem("Value", typeof(Value))]

    [XmlArrayItem("MultiValue", typeof(MultiValue))]

    public List<object> Values { get; set; }

}

​

public class MultiValue

{

    [XmlElement(ElementName = "Value")]

    public List<Value> Values { get; set; }

}

​

public class Value

{

    [XmlAttribute("AttributeID")]

    public string AttributeId { get; set; }

​

    [XmlText]

    public string Text { get; set; }

}