partial class == abstract == method overriding ?

Partial Class means when you split the definition of a class over two or more source files. Each source file contains a section of the type or method definition, and all parts are combined when the application is compiled. The purpose to create a partial class is:

When working on large projects, spreading a class over separate files enables multiple programmers to work on it at the same time.

When working with automatically generated source, code can be added to the class without having to recreate the source file. Visual Studio uses this approach when it creates Windows Forms, Web service wrapper code, and so on. You can create code that uses these classes without having to modify the file created by Visual Studio.

A partial class can be created irrespective of any inheritance coming into picture. Here you should clarify your understanding that partical class has nothing to do with abstract class or method overriding.

Abstract Class:
The abstract keyword enables you to create classes and class members that are incomplete and must be implemented in a derived class.
An abstract class cannot be instantiated. The purpose of an abstract class is to provide a common definition of a base class that multiple derived classes can share.

method overriding:

The override modifier is required to extend or modify the abstract or virtual implementation of an inherited method, property, indexer, or event. An override method provides a new implementation of a member that is inherited from a base class. The method that is overridden by an override declaration is known as the overridden base method. The overridden base method must have the same signature as the override method.

why we have these many things for doing same job?

They are not doing same job as explained above.

Moreover, I feed that this question is more suited to interviews section, and not here.

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Nilesh Shah9y ago
Partial Class means when you split the definition of a class over two or more source files. Each source file contains a section of the type or method definition, and all parts are combined when the application is compiled. The purpose to create a partial class is:
- When working on large projects, spreading a class over separate files enables multiple programmers to work on it at the same time.
- When working with automatically generated source, code can be added to the class without having to recreate the source file. Visual Studio uses this approach when it creates Windows Forms, Web service wrapper code, and so on. You can create code that uses these classes without having to modify the file created by Visual Studio.
A partial class can be created irrespective of any inheritance coming into picture. Here you should clarify your understanding that partical class has nothing to do with abstract class or method overriding.

Abstract Class:
The abstract keyword enables you to create classes and class members that are incomplete and must be implemented in a derived class.
An abstract class cannot be instantiated. The purpose of an abstract class is to provide a common definition of a base class that multiple derived classes can share.

method overriding:
The override modifier is required to extend or modify the abstract or virtual implementation of an inherited method, property, indexer, or event. An override method provides a new implementation of a member that is inherited from a base class. The method that is overridden by an override declaration is known as the overridden base method. The overridden base method must have the same signature as the override method.

why we have these many things for doing same job?
They are not doing same job as explained above.

Moreover, I feed that this question is more suited to interviews section, and not here.