What is the use of ‘new’ keyword in C#?

Use the new keyword to create an instance of the array −

int [] a = new int[5];

The new operator is used to create an object or instantiate an object. Here in the example, an object is created for the class using the new −

Example

 Live Demo

using System;

namespace CalculatorApplication {
   class NumberManipulator {
      public void swap(int x, int y) {
         int temp;

         temp = x; /* save the value of x */
         x = y; /* put y into x */
         y = temp; /* put temp into y */
      }
      static void Main(string[] args) {
         NumberManipulator n = new NumberManipulator();

         /* local variable definition */
         int a = 100;
         int b = 200;
         Console.WriteLine("Before swap, value of a : {0}", a);
         Console.WriteLine("Before swap, value of b : {0}", b);
         /* calling a function to swap the values */
         n.swap(a, b);
         Console.WriteLine("After swap, value of a : {0}", a);
         Console.WriteLine("After swap, value of b : {0}", b);
         Console.ReadLine();
      }
   }
}

Output

Before swap, value of a : 100
Before swap, value of b : 200
After swap, value of a : 100
After swap, value of b : 200