OOP (object oriented programming)What is the class?What do you mean by object?What are the differences between class and object?Can you create an object without using new operator in C#?What is constructor and how many constructors can have one class?Differences between constructor and method of the class? What is default constructor?What is parameterized Constructor in C#?What is private constructor: In what instances you will declare a constructor to be private?What is static constructor, Is it possible to have a static constructor in class. If yes why we need to have a static constructor?Does C# provide copy constructor for an object? 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What are the Static fields and methodsWhat is Static ReadOnly?What are the limitations of static?What is readonly? What’s the difference between constant and read-only?What is this keyword?What is base keyword?What is the difference between this and base keyword?Can “this” keyword be used within static method?What are the accessors?What is the static class? Why we need of static class?If someone wants to create static class then what are the rules for the static class?What are the limitations of using static keyword?What are finalizers in c#?How to create N number of instances of C# class?What are the Nested Classes and why we use them?What are the basic four pillars of OOP?What is the Inheritance and why we need of inheritance?How do you inherit a class into other class in C#?What is the concept of base and derive class?What are the different types of inheritance?We have two classes’ base class and child class. A is the base class and B is the child class, If we create an instance of child class then which class’s constructor called first?Does a derived class can inherit the constructors of its base class?What should we do that if we create an object of child class then the parameterized constructor of base class must be invoked?As we know that base constructor invoked first when we create instance of child class but if we create an instance of child class by parameterized constructor and base class has both default and parameterized constructor then which constructor of the base will be invoked?Can you assign an object of derived class to the variable of base class and if both have the same method name then which will be invoked?Can we create instance of base class and store it to derive class?Can we create derive class object inside base class, and if create instance of child class then what will happen?Can we inherit child class from 2 base classes? if yes then how? If not then why?Does C# support Multiple Inheritance?Why multiple inheritance is not supported in C# and why it’s supported in C++?How is multiple inheritance achieved in C#?What are Access Modifiers? Explain private, public, protected, internal, protected internal access modifiersWhat are the default access modifiers of the class?Why classes cannot be declared as protected?Can we declare private class in namespace?What are the valid access specifier used for the declaration of class at namespace level? If we inherit a class, do the private variables also get inherited?Can you prevent your class from being inherited?Can you prevent your class from being inherited without using sealed keyword?What is abstraction?What is encapsulation?What is the difference between abstraction and encapsulation?What is polymorphism?What is static or compile time polymorphism?What is runtime polymorphism or late binding or dynamic binding?What is method overloading?When and why we should use overload methods?What is inheritance based overloading?What are the advantages of using overloading?Can we overload the method in the same class?What is the execution control flow in overloaded methods?What is method overriding?What s virtual keyword?What are the key points to make the method as overridden?When it is must to override the method?When a derived class can overrides the base class member?Can we declare fields inside the class as virtual?When we treat sub-class method as an overriding method?Can we override private virtual method in c#?Can we override method in the same class?Can we execute parent class method if it is overridden in the child class?If we have virtual in base class and the same method is overridden in child class, by creating instance of child class and assign it to base class, then which of the method will be invoked first.What is the difference between method overloading and method overriding?What is method hiding?Can you access a hidden method in the derived which is declared in the base class?What is the difference between method overriding and method hiding?You have a component with 2 parameters and deployed to client side, now you have changed your method with 3 parameters, how can you deploy this without affecting the client code?What is operator overloading?What is abstract class and why we need of it?What are the rules of abstract classes?What is an abstract method?What is concrete method?When do you use abstract class in C#?When to use the abstract method in C#?

What is method overloading?

Method overloading is a concept in programming where multiple methods in the same class can have the same name but different parameter lists. This allows you to provide different ways to call a method based on the type or number of arguments passed. The appropriate method to be called is determined at compile time based on the arguments provided.

We can perform method overloading in C# by two ways:
• Method overloading by changing no of parameters
• Method overloading by using different data type of the arguments

Let's illustrate method overloading with a real-time example using a simple calculator class in C#:

using System;

class Calculator
    public int Add(int a, int b)
        return a + b;

    public double Add(double a, double b)
        return a + b;

    public string Add(string a, string b)
        return a + b;

class Program
    static void Main(string[] args)
        Calculator calculator = new Calculator();

        int result1 = calculator.Add(5, 10);
        double result2 = calculator.Add(3.5, 2.8);
        string result3 = calculator.Add("Hello, ", "world!");

        Console.WriteLine("Result 1: " + result1);
        Console.WriteLine("Result 2: " + result2);
        Console.WriteLine("Result 3: " + result3);
In this example, the 'Calculator' class has three 'Add' methods with different parameter types:
  1. 'Add(int a, int b)' - Adds two integers and returns an integer result.
  2. 'Add(double a, double b)' - Adds two doubles and returns a double result.
  3. 'Add(string a, string b)' - Concatenates two strings and returns a string result.

When you run the program, you'll see the following output:

Result 1: 15
Result 2: 6.3
Result 3: Hello, world!

Even though all the methods are named 'Add', the appropriate version of the method to be called is determined at compile-time based on the argument types. This demonstrates method overloading, where the same method name is used to provide different behaviors based on the types of arguments.

Here are some key points to remember about method overloading:
  1. Same Method Name: Method overloading involves creating multiple methods within the same class with the same name.
  2. Different Parameters: Overloaded methods must have different parameter lists. This can involve a different number or type of parameters.
  3. Compile-Time Resolution: The decision about which overloaded method to call is made by the compiler at compile time, based on the arguments provided.
  4. Return Type Not Considered: The return type of the method is not taken into account when determining which overloaded method to call.
  5. Access Modifiers: Overloaded methods can have different access modifiers (public, private, protected, etc.), but they must have the same name and compatible parameter lists.
  6. Changing Only Return Type Is Not Overloading: Overloading is not determined by just changing the return type of a method. The parameter list must differ.
  7. Can Improve Readability: Method overloading can make the code more readable by providing clear and intuitive method names for different variations of functionality.
  8. Examples: Overloading is often used for constructors with different parameter sets, mathematical operations (int, double), and type conversions (ToString).
  9. Polymorphism Not Involved: Method overloading is not a form of polymorphism. It is a form of compile-time (static) polymorphism, whereas runtime polymorphism involves method overriding in inheritance hierarchies.
  10. Best Practices: Overloading should be used sensibly to enhance code clarity and avoid confusion. Overloading with too many variations can make code harder to understand.
  11. Documentation: Document your overloaded methods well, explaining their purpose and the differences in parameter sets.
  12. Common Naming Convention: Overloaded methods should ideally have names that convey their purpose along with the parameters they accept. This helps other developers understand their functionality.

Remember, method overloading allows you to provide multiple versions of a method with different parameter lists, enhancing the flexibility and usability of your codebase.