why we use inheritance in c#

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Inheritance is a useful programming concept, but it is easy to use inappropriately. Often interfaces do the job better. This topic and When to Use Interfaces help you understand when each approach should be used.

Inheritance is a good choice when:

• Your inheritance hierarchy represents an "is-a" relationship and not a "has-a" relationship.

• You can reuse code from the base classes.

• You need to apply the same class and methods to different data types.

• The class hierarchy is reasonably shallow, and other developers are not likely to add many more levels.

• You want to make global changes to derived classes by changing a base class.

These considerations are discussed in order below.

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You know the saying...more than one way to skin a cat.

"Need" is a strong word here. Programming is constantly evolving, first off. It's the nature of the game. Programmers try to make life easier through technology. Their own lives, included.

Object Oriented Programming tackles many dilemmas programmers had faced for a long time. Inelegant, spaghetti code with repeated modules everywhere, for example. As said, inheritance is an extremely important concept in OOP, and understanding it will make you a better programmer.

A few reasons though...as to why programmers brought inheritance into the mix:

DRY: Don't Repeat Yourself. It's a concept in programming that speaks about productivity, and readability. Inheritance reduces or eliminates the need for repeated code.

Complexity. OOP reduces the complexity of the code in a program (or at least, it should...). By using inheritance, your code is again, not repeated, and easier to decipher.

Maintenance. In maintaining a solution, inheritance helps out a great deal when implemented correctly.

There is a lot more to the entire OOP paradigm, but understanding the how and why of inheritance is important.

-Inheritance is a way to form new classes (instances of which are called objects) using classes that have already been defined.
-Inheritance is employed to help reuse existing code with little or no modification.
-The new classes, known as Sub-class or derived class, inherit attributes and behavior of the pre-existing classes, which are referred to as Super-class or Base class.