How to use Nullable Type in C#

This example help you get familiar with nullable types in C#. You can pass the null values in function and it will not raise any error and you can explicitly check if it contains null values.

Source Code :

using System;
using System.IO;

namespace MyApp
{
    class Program
    {
        static void Main(string[] args)
        {
            NullValueExample(200);
            NullValueExample(null);
            Console.ReadLine();
        }

        static void NullValueExample(int? Number)
        {
            if (Number.HasValue == true)
            {
                Console.WriteLine("Number has value: " + Number);
            }
            else
            {
                Console.WriteLine("Number has null value: null");
            }

            try
            {
                Console.WriteLine("Print value: = {0}", Number.Value);
            }
            catch (InvalidOperationException ex)
            {
                Console.WriteLine("Exception: " + ex.Message);
            }
        }
    }
}