Singleton design pattern

Sometimes when developing big application we come across situation when the instance of a class has to be instantiated only once.
In this scenario the design pattern we follow is named as singleton pattern. Implementing singleton pattern ensures that a class will have only one instance created and also provides a global point of access to class instance.

Singleton Design Pattern

namespace Arindam 1:{ 2: public class ETGSingleton 3: { 4: private static ETGSingleton _instance; 5: private int counter =0; 6: private ETGSingleton() 7: { 8: // 9: // TODO: Add constructor logic here 10: // 11: 12: 13: } 14: 15: public static ETGSingleton Instance 16: { 17: get 18: { 19: if (_instance == null) 20: _instance = new ETGSingleton(); 21: return _instance; 22: } 23: } 24: public int getCounter() 25: { 26: return counter++; 27: } 28: } 29:} 30:

Singleton design patterns	Proxy design patterns	Factory Abstract factory design patterns
MVP design patterns	MVC design patterns	SOA