C# Constructor

In C#, constructor is a special method which is invoked automatically at the time of object creation. It is used to initialize the data members of new object generally. The constructor in C# has the same name as class or struct.

There can be two types of constructors in C#.

• Default constructor
• Parameterized constructor

C# Default Constructor

A constructor which has no argument is known as default constructor. It is invoked at the time of creating object.

C# Default Constructor Example: Having Main() within class

1. using System;  
2.    public class Employee  
3.     {  
4.         public Employee()  
5.         {  
6.             Console.WriteLine("Default Constructor Invoked");  
7.         }  
8.         public static void Main(string[] args)  
9.         {  
10.             Employee e1 = new Employee();  
11.             Employee e2 = new Employee();  
12.         }  
13.     }  

Output:

Default Constructor Invoked 
Default Constructor Invoked

C# Default Constructor Example: Having Main() in another class

Let's see another example of default constructor where we are having Main() method in another class.

1. using System;  
2.    public class Employee  
3.     {  
4.         public Employee()  
5.         {  
6.             Console.WriteLine("Default Constructor Invoked");  
7.         }  
8.     }  
9.    class TestEmployee{  
10.        public static void Main(string[] args)  
11.         {  
12.             Employee e1 = new Employee();  
13.             Employee e2 = new Employee();  
14.         }  
15.     }  

Output:

Default Constructor Invoked 
Default Constructor Invoked

C# Parameterized Constructor

A constructor which has parameters is called parameterized constructor. It is used to provide different values to distinct objects.

1. using System;  
2.    public class Employee  
3.     {  
4.         public int id;   
5.         public String name;  
6.         public float salary;  
7.         public Employee(int i, String n,float s)  
8.         {  
9.             id = i;  
10.             name = n;  
11.             salary = s;  
12.         }  
13.         public void display()  
14.         {  
15.             Console.WriteLine(id + " " + name+" "+salary);  
16.         }  
17.    }  
18.    class TestEmployee{  
19.        public static void Main(string[] args)  
20.         {  
21.             Employee e1 = new Employee(101, "Sonoo", 890000f);  
22.             Employee e2 = new Employee(102, "Mahesh", 490000f);  
23.             e1.display();  
24.             e2.display();  
25.   
26.         }  
27.     }  

Output:

101 Sonoo 890000
102 Mahesh 490000