What is the difference between abstract class and interface in C#?

C# Programming Language > OOPS Concept > Introduction to OOP Concept

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Answer:

Abstract class can have abstract and concrete methods whereas interface has only abstract methods.

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792. What is the difference between dispose() and finalize() methods in C#?

Answer:

The dispose() method is explicitly called by user to free unmanaged resources such as files, database connections etc whereas finalize() method is implicitly called by garbage collector to free unmanaged resources like files, database connections etc.

The dispose() method belongs to IDisposable interface whereas finalize() method belongs the Object class.

# Tutorial: Introduction to OOP Concept

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793. What is the difference between method overloading and method overriding in C#?

Answer:

Method parameters must be different in method overloading whereas it must be same in method overriding.

Inheritance is not required in method overloading, it occurs within the same class. But inheritance is required in method overriding.

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794. What is object pool in .Net?

Answer:

Object pool is a container of ready to use objects. It reduces the overhead of creating new object.

# Tutorial: Introduction to OOP Concept

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795. What is delegate in C#?

Answer:

A delegate in C# is an object that holds the reference to a method. It is like function pointer in C++.

# Tutorial: Introduction to OOP Concept

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796. What is Hashtable?

Answer:

A Hashtable is a collection of key/value pairs. It contains values based on the key.

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797. What is Reflection?

Answer:

Reflection allows us to get metadata and assemblies of an object at runtime.

# Tutorial: Introduction to OOP Concept

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798. What is Garbage Collection?

Answer:

Garbage Collection is a process of releasing memory automatically occupied by objects which are no longer accessible.

# Tutorial: Introduction to OOP Concept

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