What is lazy initialization and why is it useful?

Question

What is lazy initialization of objects? How do you do that and what are the advantages?

Answer 1

//Lazy instantiation delays certain tasks. 
//It typically improves the startup time of a C# application.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace LazyLoad
{
    class Program
    {
        static void Main(string[] args)
        {
            Lazy MyLazyClass = new Lazy(); // create lazy class
            Console.WriteLine("IsValueCreated = {0}",MyLazyClass.IsValueCreated); // print value to check if initialization is over

            MyClass sample = MyLazyClass.Value; // real value Creation Time
            Console.WriteLine("Length = {0}", sample.Length); // print array length

            Console.WriteLine("IsValueCreated = {0}", MyLazyClass.IsValueCreated); // print value to check if initialization is over
            Console.ReadLine();
        }
    }

    class MyClass
    {
        int[] array;
        public MyClass()
        {
            array = new int[10];

        }

        public int Length
        {
            get
            {
                return this.array.Length;
            }
        }
    }
}


// out put

// IsValueCreated = False
// Length = 10
// IsValueCreated = True