Two implementation methods of Singleton

Code
Using system;
Using system. Collections. Generic;
Using system. text;

Namespace oodemo
{
/// <Summary>
/// Hunger Singleton mode, which is instantiated upon first loading
/// </Summary>
Public class Singleton
{

Private Static readonly Singleton instance = new Singleton ();
Private Singleton ()
{

}
Public static Singleton getinstance ()
{
Return instance;
}

}

/// <Summary>
/// Lazy Singleton mode, which starts to be instantiated when it is referenced for the first time
/// </Summary>
Public class singletonpattern
{
Private Static singletonpattern instance;
Private Static object OBJ;
Private singletonpattern (){}
Public static singletonpattern getinstance ()
{
If (instance = NULL)
{
Lock (OBJ)
{
If (instance = NULL)
{
Return new singletonpattern ();
}

}
}
}
}

}