Achieve Persistence Through Serialization

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Reflection;
using System.Drawing;
using System.Xml.Serialization;

namespace Trestan
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Normally we will create GUI for user interaction. Here we just use console as a demo.\n");
            Console.WriteLine("Configuration settings:\n");
            Console.WriteLine("ServerIP: "+Configuration.Instance.ServerIP);
            Console.WriteLine("ServerPort: " + Configuration.Instance.ServerPort);
            Console.WriteLine("UserName: " + Configuration.Instance.CurrentUser.UserName);
            Console.WriteLine("UserID: " + Configuration.Instance.CurrentUser.UserID);
            Console.WriteLine("\nPlease input user name: ");
            Configuration.Instance.CurrentUser.UserName = Console.ReadLine();
            Configuration.Instance.CurrentUser.UserID = 1001;   //In real application, this value will be obtained from server side after athentication.
            Configuration.Instance.ServerIP = Utility.getHostIP();
            Configuration.Instance.Save();

            Console.WriteLine("Press enter to exit. Run the program again will show new settings.");
            Console.Read();
        }
    }
}