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();
}
}
}

Steps to test above:

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

Above will produce an executable file nullableclass.exe, double click on this file.

Note :

You can also verify to uncomment above commented lines.

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