using System.Collections.Generic;

using System;

using System.Xml;

using System.Xml.Serialization;

using System.IO;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        var model = new Model{

            Sub = new SubModel{

                Values = new List<ValueModel>{

                    new ValueModel{

                        Test = "Vasya",

                    },

                    new ValueModel{

                        Test = "Perya",

                    },

                    new ValueModel{

                        Test = "Igor",

                    },

                },

            },

            Values = new List<ValueModel>{

                new ValueModel{

                    Test = "Vasya",

                },

                new ValueModel{

                    Test = "Perya",

                },

                new ValueModel{

                    Test = "Igor",

                },

            },

        };

        Console.WriteLine(SerializeObject(model));

    }

    public static string SerializeObject<T>(T toSerialize)

    {

        XmlSerializer xmlSerializer = new XmlSerializer(toSerialize.GetType());

​

        using(StringWriter textWriter = new StringWriter())

        {

            xmlSerializer.Serialize(textWriter, toSerialize);

            return textWriter.ToString();

        }

    }

    public sealed class Model{

        [XmlElement("Sub")]

        public SubModel Sub {get;set;}

        [XmlArray("Va2"), XmlArrayItem("Va")]

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

    }

    public sealed class SubModel{

        [XmlElement("Va")]

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

    }

    public sealed class ValueModel{

        public string Test{get;set;}

    }

}