Singleton Class Uses and Drawbacks

Singleton :-
Singleton is controversial design pattern of OOPS. It allows you to restrict the number of instances of an object.It's an interface that allows a class to enforce that it is only allocated once.

Sample Code :-

Namespace :-
using system.text;
using System.collections;

class SampleProgram
{
public static void Main()
{
SingletonStructure singleton = SingletonStructure.Instance;
}
}

public sealed class SingletonStructure
{
static readonly SingletonStructure _instance = new SingletonStructure();
public static SingletonStructure Instance
{
get
{
return _instance;
}
}
Constructor which will be initialize and create the instance
SingletonStructure()
{
// Initialize.
}
}

Null check singleton: 435 ms
Optimized singleton : 42 ms (As Above)

This method is fast beacause instance member is created directly in its declaration