C# - What is a Constructor

Constructor in C#

In C#, a constructor is a specialized method that is automatically called when an object is created. It is typically used to initialize the data members of the newly created object. In C#, the constructor shares the same name as the class or struct.

Example of constructor:

class LetsUpdateSkills
{   
  .......
  // Constructor
  public LetsUpdateSkills() {}
  .......
}

// an object is created of LetsUpdateSkills class,
// So above constructor is called
LetsUpdateSkills obj = new LetsUpdateSkills(); 

Note that the constructor name must match the class name, and it cannot have a return type (like void or int).

All classes have constructors by default, If you do not create a class constructor yourself, C# creates one for you. However, then you are not able to set initial values for fields.

There can be two types of constructors in C#.

1. Default constructor
2. Parameterized constructor

Default Constructor:

A constructor without any arguments is called a default constructor. It is automatically invoked when an object is created.

using System;  
   public class Student
    {  
        public Student()  
        {  
            Console.WriteLine("Default Constructor Invoked");  
        }  
        public static void Main(string[] args)  
        {  
            Student s1 = new Student();  
            Student s2 = new Student();  
        }  
    }  

Constructors save time! Take a look at the last example on this page to really understand why.