Difference between Abstract Class and Interface in .NET Programming

In .NET programming, the main differences between an abstract class and an interface are:

• Definition: An abstract class is a class that may contain both abstract and non-abstract members, while an interface is a reference type that contains only abstract members.
• Inheritance: A class can inherit only one abstract class, but can implement multiple interfaces.
• Access Modifiers: Abstract classes can have access modifiers for their members, while interfaces have all their members as public by default.
• Code Reusability: Interfaces promote better code reusability as they allow multiple inheritance, whereas abstract classes provide a way to define a blueprint for classes that inherit from it.
• Multiple Inheritance: While a class in C# cannot inherit from multiple classes, it can implement multiple interfaces, allowing for flexibility in design.