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? How do you call the multiple constructors of a class with single object creation?What is constructor chaining in C#?Can a constructor be called directly from a method?What is constructor overloading and how it’s different than method overloading?What is the difference between constructor overloading and method overloading?Is it possible to overload copy constructor in C#?Can we overload static constructors in C#?Can we overload private constructors in C#?Can we give return type of the constructor in C#?What is the destructor and when it’s called?Is it possible to call constructor and destructor explicitly?What is the Structure and why we need it although we have a class?What are the similarities between Class and Structure?What is the difference between Class and Structure?What is copy structure?What is nested structure?Is it always necessary to create an object of the class?How many different ways to create an object of the class?What are the pros and cons of creating object by new() keyword?What are the pros and cons of delegate object creation to DI container?What are the pros and cons of creating an object by reflection?What are the pros and cons of getting an object from an object pool?What are the pros and cons of creating an object by deserialization?Is it possible to create an object without a class in C#?What is constant?What is static modifier? 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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#?

How do you call the multiple constructors of a class with single object creation?

In C#, you can call multiple constructors of a class with a single object creation using constructor chaining. Constructor chaining allows you to invoke one constructor from another constructor within the same class. This allows you to reuse initialization logic and avoid code duplication.

To achieve constructor chaining, you use the 'this' keyword followed by the appropriate constructor parameters. The 'this' keyword refers to the current instance of the class. By using 'this' to call another constructor, you can pass the required parameters and execute the common initialization logic.

Here's an example of how to use constructor chaining in a class:

class MyClass
    public int Value1;
    public int Value2;

    // Constructor with one parameter
    public MyClass(int value1) : this(value1, 0)
        // This constructor calls the constructor with two parameters, passing 'value1' and '0'
        // It allows us to reuse the logic and avoid code duplication

    // Constructor with two parameters
    public MyClass(int value1, int value2)
        this.Value1 = value1;
        this.Value2 = value2;

In the above example, we have two constructors in the 'MyClass' class. The first constructor takes one parameter ('value1') and uses constructor chaining to call the second constructor with two parameters, passing 'value1' and '0' as arguments. The second constructor initializes the 'Value1' and 'Value2' properties.

Here's how you can use the constructors:

MyClass obj1 = new MyClass(10);
Console.WriteLine(obj1.Value1); // Output: 10
Console.WriteLine(obj1.Value2); // Output: 0

MyClass obj2 = new MyClass(20, 30);
Console.WriteLine(obj2.Value1); // Output: 20
Console.WriteLine(obj2.Value2); // Output: 30

As shown in the example, you can create a single object and call different constructors using different parameter combinations. Constructor chaining allows you to provide flexibility in object initialization while reusing the common initialization logic.

Here's another example that demonstrates the 'MathExam' class, which includes three constructors. The first one is the default constructor that needs to be invoked. The other two constructors are parameterized constructors, and we are passing 2 and 3 parameters to them, respectively.

When we create an instance of this class by invoking the default constructor, multiple constructors will be called.

MathExam obj = new MathExam();