public static void Main()
Console.WriteLine(string.Format(
"Currently logged in user with token {0}, user is {1} years old",
UserInfo.Instance.UserToken, (DateTime.Now - UserInfo.Instance.DateOfBirth).Days / 365));
public sealed class UserInfo
private static readonly UserInfo _instance;
_instance = new UserInfo();
_instance.DateOfBirth = new DateTime(1986, 3, 20);
_instance.UserToken = Guid.Parse("c1a62826-b1e9-4bec-9607-9dc1dbbac1d1");
public static UserInfo Instance
get { return _instance; }
public Guid UserToken {get;set;}
public DateTime DateOfBirth {get;set;}