C# this

In c# programming, this is a keyword that refers to the current instance of the class. There can be 3 main usage of this keyword in C#.

• It can be used to refer current class instance variable. It is used if field names (instance variables) and parameter names are same, that is why both can be distinguish easily.
• It can be used to pass current object as a parameter to another method.
• It can be used to declare indexers.

C# this example

Let's see the example of this keyword in C# that refers to the fields of current class.

1. using System;  
2.    public class Employee  
3.     {  
4.         public int id;   
5.         public String name;  
6.         public float salary;  
7.         public Employee(int id, String name,float salary)  
8.         {  
9.             this.id = id;  
10.             this.name = name;  
11.             this.salary = salary;  
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

We will learn about other usage of this keyword in next chapters.