How to generate XML file for class file

namespace Client.ConsoleX
{
    
    public class Program
    {
        MainServiceClient mainServiceClient = new MainServiceClient();
        public static void Main()
        {
            #region list GEnerateion
            Visibilities vlist = new Visibilities();
            Visibility v = new Visibility();
            v.Name = new FullName();
            vlist.AppName = "Test2";
            v.Name.FirstName = "First Name";
            v.Name.MiddleName = "Middle Name";
            v.Name.LastName = "Last Name";
            v.DisplayName = "Display Name";
            //vlist.Visibility.Add(new Visibility() { ListOrder = 2, DisplayName = "Name", Name = v.Name });
            //vlist.Visibility.Add(v);
            List<Visibility> list = new List<Visibility>();
            list.Add(v);
            vlist.Visibility = list;
            File.WriteAllText(@"d:\Test1.xml", vlist.ToString());
            Console.WriteLine("Sucessfully created the xml file...");
            #endregion
            
            Console.ReadKey();
        }
        
                        
    }
    #region
    [Serializable]
    public class FullName
    {
        private String strFirstName;
        [XmlAttribute("FirstName")]
        public String FirstName
        {
            get { return strFirstName; }
            set { strFirstName = value; }
        }
        private String strMiddleName;
        [XmlAttribute("MiddleName")]
        public String MiddleName
        {
            get { return strMiddleName; }
            set { strMiddleName = value; }
        }
        private String strLastName;
        [XmlAttribute("LastName")]
        public String LastName
        {
            get { return strLastName; }
            set { strLastName = value; }
        }
    }
    #endregion
    #region Visibility
    [Serializable]
    public class Visibility
    {
        [XmlElement("Name")]
        public FullName Name { get; set; }
        [XmlAttribute("DisplayName")]
        public String DisplayName { get; set; }
        [XmlAttribute("ListOrder")]
        public int ListOrder { get; set; }
    }
    #endregion
    #region Visibilities
    [Serializable]
    public class Visibilities
    {
        [XmlAttribute("AppName")]
        public String AppName { get; set; }
        [XmlElement("Visibility")]
        public List<Visibility> Visibility { get; set; }
        #region
        public override string ToString()
        {
            string l_strXML = string.Empty;
            XmlSerializer Xml = new System.Xml.Serialization.XmlSerializer(GetType());
            MemoryStream ms = new MemoryStream();
            Xml.Serialize(ms, this);
            Byte[] Buffer = new byte[ms.Length];
            ms.Seek(0, 0);
            ms.Read(Buffer, 0, (int)ms.Length);
            l_strXML = System.Text.Encoding.ASCII.GetString(Buffer, 0, (int)ms.Length);
            return l_strXML;
        }
        #endregion
    }
    #endregion
}