C# - Tutorial for Beginners - Part 3

C# - Beginners Tutorial – 3

Access Specifiers and Characterstics of OOPS

Access Specifiers (in C Sharp) :

• Access specifiers or Visibility mode is used to discuss about the scope of the variables and functions used inside a class .
• Access specifiers are mainly used to increase the protection level for the particular Methods or variables used in the class.
• Access specifiers may be used for implementing the concept of Encapsulation and Abstraction(Which was discussed in the previous tutorial).
• 5 Major types of Access specifiers are discussed below :

1.  Public
2.  Private
3.  Protected
4.  Internal
5.  Protected internal

PUBLIC :

• Public access specifier allows a class to share its members and functions with other classes. It may be within or outside the application.
• Any member declared as public can be accessed anywhere in the class.

PRIVATE:

• Private access specifier allows a class to share its members and functions only within the same class.
• Members and Methods declared in one class cannot be accessed from outside the class.
• When a method is declared private , even the instance of that class cannot access it .

PROTECTED:

• Protected access specifiers provides access only for the derived class to access its member variables and functions within the application.
• Protected member variables and functions cannot be accessed from outside the class.

INTERNAL:

• The default access specifier is Internal.
• A member variable or function declared internal can be accessed by any of the class or method within the application..
• Internal members cannot be accessed from the classes outside the Application.

PROTECTED INTERNAL:

• Protected Internal access specifier allows a class to expose its member variables and functions to the class containing it , its child class , any other classes within the application.


• They are not applicable to the classes outside the application.

These Access specifiers will be explained with the example using C Sharp in the next tutorial, so that you can get a clear idea about how and where to use the access specifiers.

CHARACTERSTICS OF OBJECT ORIENTED APPROACH :

1)    Realistic Modeling :

• Everything we use in our programs are objects . Real world objects are also present . These objects may contain its own attributes and behaviours. These attributes and behaviours depict how the object acts and reacts.

2)    Reusability :

• This characterstics depicts that the Member variables and methods used in a class can be reused. The existing methods and functions can be used anywhere in an application.This feature of reusability makes Object oriented approach a more standard and efficient one.

3)    Flexibility to Change :

• In an existing system , when a change is to be brought, the existing system need not be completely destroyed. Enhancement of some new features in the existing system makes it as a new system. New features can be easily added in the existing system to bring a new product. Thus OOPS provides you a flexibility in efficient change of the System.

• In the upcoming tutorials we will just move on to the Introduction to Compilers , how does it works and Syntax for declaring variables processing operations in C Sharp and Various Programs will be updated for your reference . Kindly Make use of it .

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