Operator Overloading

  int a = 10; b = 20;,c;

C= a + b-arrrow30  (Addition)

String S1 = ‘ABC’, S2 = ‘XYZ’,S3;

S3 = S1+S2arrrowAbc xyz  (concatenation)

Assume that test is a class and t1,t2,t3 are objects then

T3 = t1+t2

gives an error ‘+’ operator is developed to use with numbers and string only BUT NOT WITH OBJECTS.  

Operator overloading is a concept of extending the functionality of an Existing operator.

All the operators are overloadable except those contains a.

These core tutorials will help you to learn the fundamentals of .NET. For an in-depth understanding and practical experience, explore Online ".NET Training"

That is the following operators are not overloadable.

  arrrow  member Access operator

:: Ternary or conditional operator

:: property access operator

:   Inheritance operator

While overloading relational operators, these must be overloaded in ‘PAIR’.  

To overload >, < must be overloaded

To overload >=, <= must be overloaded.

To overload ==,!= must be overloaded.  

An overloaded operator must be declared as static.

Operator is a keyword.

Syntax to overloaded an operator  

Public static return type  operator + (args)




Example:-  on overloading + operator for adding the objects  

Class EMP {

Private int Sal;







 arrrow Sal (5000) E2

arrrow Sal (8000) E3  

arrrow Sal (2700)  

E1+E2+E3 = EMP(Data type)  

Open windows forms Application project à Place a button

arrrow Code in GD  

Class EMP


Private int Sal;

Public EMP (int x )

// constructor


Sal = X;


Public EMP ()

// Default constructor


Public void Print ()


Message Box. Show (Sal);


//overloading + public static EMP operator + (EMP X , EMP y)


EMP t = new EMP ();

Sal = X. Sal + Y. Sal;

return t;


operator overloading

}// EMP class

Code for Button 1_click


EMP e1 = new EMP (5000);

EMP e2 = new EMP (8000);

EMP e3 = new EMP (5000);

EMP total = new EMP ();

Total = e1 +e2+e3 ;

Total .Print ();