Nullables in C# - A Console Program

Nullables in C#

Defiition:

Nullable types are instances if System.Nullable. A nullable type can represent the normal range of values of its underlying value type plus an additional null value.

Purpose:

The purpose of this code-snippet to describe the use of nullable types with little different of a general type.

Following Console code-block tells the all above :

/* This Example is a part of different 
 * examples shown in Book: 
 * C#2005 Beginners: A Step Ahead
 * Written by: Gaurav Arora 
 * Reach at : msdotnetheaven.com 
 * File Name: nullable.cs */


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

namespace AStepAhead.Nullable
{
    class nullableclass
    {
        static void Main(string[] args)
        {
            int? num = null;
            int? num1 = null;
            if (num.HasValue == true)
            {
                Console.WriteLine("Num : {0}", num);
            }
            else
            {
                Console.WriteLine("Num has Null value");
            }

            //int y = num.GetValueOrDefault();  //throw an exception
            int z;
            try
            {
                //y = num.Value;
                //Console.WriteLine("Y:{0}", y);
                z = num1 ?? 2;
                Console.WriteLine("Z:{0}", z);
            }
            catch(Exception ex)
            {
                Console.WriteLine(ex.Message);
            }


            Console.ReadLine();
        }
    }
}

1. Open Console Window of available Visual Studio.


2. Start - > Programs -> Visual Studio [version] ->Visual Studio Tools - >Console


3. Now compile the abovefrom console as follow:
   

/>csc .exe nullableclass.cs