Single pattern

1. /// <summary>
2. /// The 'Singleton' class
3. /// </summary>
4. public class Singleton
5. {
6. // .NET guarantees thread safety for static initialization
7. private static Singleton instance = null;
8. private string Name{get;set;}
9. private string IP{get;set;}
10. private Singleton()
11. {
12. //To DO: Remove below line
13. Console.WriteLine("Singleton Intance");
14.  
15. Name = "Server1";
16. IP = "192.168.1.23";
17. }
18. // Lock synchronization object
19. private static object syncLock = new object();
20.  
21. public static Singleton Instance
22. {
23. get
24. {
25. // Support multithreaded applications through
26. // 'Double checked locking' pattern which (once
27. // the instance exists) avoids locking each
28. // time the method is invoked
29. lock (syncLock)
30. {
31. if (Singleton.instance == null)
32. Singleton.instance = new Singleton();
33.  
34. return Singleton.instance;
35. }
36. }
37. }
38.  
39. public void Show()
40. {
41. Console.WriteLine("Server Information is : Name={0} & IP={1}", IP, Name);
42. }
43.  
44. }
45.  
46. /// <summary>
47. /// Singleton Pattern Demo
48. /// </summary>
49. ///
50. class Program
51. {
52. static void Main(string[] args)
53. {
54. Singleton.Instance.Show();
55. Singleton.Instance.Show();
56.  
57. Console.ReadKey();
58. }