What is Lazy initialization in c#.net

Lazy initialization

For improving the performace of the application object will initializaed at first usage. This process is called as Lazy initialization.

Example:
In the singleton design pattern we are using this Lazy initialization. Please check below example. In this we are using lazy Initialization in public static SingletonTest returnInstanc() this method.

   class Program
    {
        static void Main(string[] args)
        {
//can't use new keyword due to protection level. 
            SingletonTest logFile = SingletonTest.returnInstanc(); //http://aspnettutorialonline.blogspot.com/
            logFile.Code = "http://aspnettutorialonline.blogspot.com/";
            Console.WriteLine(logFile.Code);
            Console.ReadLine();
        }
    }

//singleton class having private constructor. 
    class SingletonTest
    {
        private static SingletonTest singletonTest = null;
//http://aspnettutorialonline.blogspot.com/
//creating a property
        private string code = string.Empty;

        private SingletonTest()
        {
            code = string.Empty;
        }

        public static SingletonTest returnInstanc()
        {
//lazy initialization 
            if (singletonTest == null)
                singletonTest = new SingletonTest();
            return singletonTest;
        }
//exposing property to the other classes.
        public string Code
        {
            get { return code; }
            set { code = value; }
        }
    }

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