C# Null | C# Nullable - c# - c# tutorial - c# net




What is Nullable type in C# ?

  • A value type variable cannot be null.
  • A nullable type can represent the correct range of values for its underlying value type, plus an additional null value.
  • Nullable types can represent all the values of an underlying type, and an additional null value.
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Nullable in csharp

Syntax:

<data_type> ? <variable_name> = null;

C# Sample Code - C# Examples:

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

namespace Wikitechy_naullable
{
    class Program
    {
        static void Main(string[] args)
        {
            int? a = null;

            int? b = 10;

            double? c = new double?();

            double? d = 2.2254;

            Console.WriteLine("wikitechy says the Nullables values are: {0}, {1}, 
            {2}, {3}", a, b, c, d);

            Console.ReadLine();
        }
    }
}

Code Explanation:

 c sharp nullable
  1. Integer type can also be assigned the value a null : int? a = null;
  2. Integer type can also be b assigned the value 10 null: int? b = 10;
  3. It is used to store large and small values. It is used to new double type that assigned to the c variable
  4. Double type can also be d assigned the value double? d = 2.2254; null: double? d = 2.2254;
  5. In Console.WriteLine, the Main method specifies its behavior with the statement "wikitechy says the Nullables values are:". to be displayed on the screen.

Sample C# examples - Output :

 c sharp nullable string
  1. Here in this output we display the "wikitechy says the Nullables values are: , 10, , 2.2254" which specifies to integer variable a "null", integer b variable value as 10, new double value and double variable d value as 2.2254.

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