C# this Keyword

In C#, this is a keyword used to refer current class instance. It is mainly used to distinguish instance variables of the class and formal parameters defined in a constructor call. this can also be used to return current class object from a method.  It can also be passed in a method.

C# this keyword Example1:
 using System;
public class Student
{
            int id,batch;
            string name,course;
            public Student(int id,int batch,string name,string course)
            {
                        this.id=id;
                        this.batch=batch;
                        this.name=name;
                        this.course=course;
            }
            public void display()
            {
                        Console.WriteLine(id+" "+batch+" "+name+" "+course);
            }
}
public class ThisExample
{
            public static void Main(string[] args)
            {
            Student s1=new Student(101,2017,"Ayush Sharma","B. Tech.");
            Student s2=new Student(102,2016,"Krishna Kumar","B. Tech.");
            s1.display();
            s2.display();     
            }
}
C# this Keyword Example 2: calling current class method by this
using System;
public class ThisExample2
{
            public void m()
            {
                        Console.WriteLine("Hey You Are in M Method");
            }
            public void n()
            {
                        this.m();//m()
                        Console.WriteLine("Hey you Are in N method");
            }
            public static void Main(string[] args)
            {
                        ThisExample2 t1=new ThisExample2();
                        t1.n();
            }
}
Output
Hey You Are in M Method
Hey you Are in N method
C# this Keyword Example 3: passing this in a method
using System;
public class Employee
{
            public int id,age;
            public string name;
            public float salary;
            public Employee(int id,int age,string name,float salary)
            {
                        this.id=id;
                        this.name=name;
                        this.age=age;
                        this.salary=salary;
            }
            public void display()
            {
                        Display.display(this);
                        Console.WriteLine("printing inside employee class....");
                        Console.WriteLine(id+" "+name+" "+salary+" "+age);
            }
            
            public static void Main(string[] args)
            {
                        Employee emp=new Employee(101,24,"Ravi malik",25000);
                        emp.display();
            }
}
public class Display
{
            public static void display(Employee emp)
            {
                        Console.WriteLine("printing inside Display class…");
                        Console.WriteLine(emp.id+" "+emp.name+" "+emp.salary+" "+emp.age);
            }
}
Output
printing inside Display clas...
101 Ravi malik 25000 24
printing inside employee class....
101 Ravi malik 25000 24
C# this keyword Example: Returning this from the method
using System;
public class Employee
{
            public Employee returnObject()
            {
                        return this;
            }
            public void show()
            {
                        Console.WriteLine("Inside Show Method...");
            }
            public static void Main(string[] args)
            {
                        Employee emp1=new Employee();
                        emp1.show();
                        Employee emp2=emp1.returnObject();
                        emp2.show();
            }
}
Output
Inside Show Method...
Inside Show Method...



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