.NET interview questions: -Steps to implement dynamic polymorphism?

This is the .NET interview questions which you come across many a times. So following is the answer to it with explanation.

Dynamic polymorphism is implemented by using overriding and virtual keyword.

Below is a simple code snippet which has three classes, Customer class is the parent class.CustomerDiscount10Percent and CustomerDiscount20Percent are child classes.

Customer parent class has a discount function which returns zero discounts. This function is defined as virtual and then overridden by both the child classes with 10 and 20% discount.

class Customer
public string customerName;
public string customerCode;
public virtual int Discount()
return 0;

class CustomerDiscount10Percent : Customer
public override int Discount()
return 10;


class CustomerDiscount20Percent : Customer
public override int Discount()
return 20;


At the client side on the fly your parent object can point to any child
classes and invoke the child implementation accordingly. This is called as dynamic polymorphism; the parent object can point to any of the child objects and invoke the child function dynamically.

Customer obj;
obj = new CustomerDiscount10Percent();
obj = new CustomerDiscount20Percent();

See the following UML video on Use Case Diagram: –

important Dotnet interview questions for preparation of real time interviews.


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