What is the default constructor in C#?

A class constructor is a special member function of a class that is executed whenever we create new objects of that class. A default constructor does not have any parameter.

The following is an example showing how to work with default constructor in C# −


 Live Demo

using System;

namespace LineApplication {
   class Line {
      private double length; // Length of a line

      public Line(double len) { //Parameterized constructor
      Console.WriteLine("Object is being created, length = {0}", len);
         length = len;

      public void setLength( double len ) {
         length = len;

      public double getLength() {
         return length;

      static void Main(string[] args) {
         Line line = new Line(10.0);
         Console.WriteLine("Length of line : {0}", line.getLength());

         // set line length
         Console.WriteLine("Length of line : {0}", line.getLength());


Object is being created, length = 10
Length of line : 10
Length of line : 6

Updated on: 20-Jun-2020


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