abstraction and encapsulation in c#


While in . While encapsulation is the process or method to contain the information. grouping into single units. and hide unnecessary information from the user. Abstraction solves the problem and issues that arise at the design stage. They provide public methods for the outside world to manipulate data and keep the rest of the class structure to . }. This video explains abstraction & encapsulation of oops concept in detailed For a language to be classified as OOP, it must have . Encapsulation is the procedure of encapsulating data and functions into a class. The, method is provided by Microsoft and they have written a lot of code behind the, method but, they don't show all the code to the user. code of conduct because it is harassing, offensive or spammy. return (x + y); Console.WriteLine("My name is: " + name); In this blog , we will learn what is Diamond problem in c# and We will learn Diamond problem in c# with a simple example . The class is the best example of Encapsulation. The above codes show for calculate summary of 2 integers. Encapsulation and abstraction is the advanced mechanism in C# that lets your program to hide unwanted code within a capsule and shows only essential features of an object. Whereas encapsulation can be implemented using by access modifier i.e. This behavior of the class can . Data abstraction is an attribute that shows only basic details to users. The class helps us to group data members and member functions using available access specifiers. With you every step of your journey. These programming techniques can help developers write clean code, save spaces and easily maintain programs. For example: We can easily implement abstraction using the above two features provided by access specifiers. Encapsulation Encapsulation is used to restrict access to methods and variables. It will become hidden in your post, but will still be visible via the comment's permalink. These modifiers are public, private, internal, protected and protected internal. If ivanchen420 is not suspended, they can still re-publish their posts from their dashboard. Whenever I read about this two main OOP's concepts in any of the book or blog, I used to get some predefined definitions and failed to get the real meaning. C++ Encapsulation. Abstraction using classes: An abstraction can be achieved using classes. Click here to navigate to parent product. One more type of abstraction in C++ can be header files. Hello All. private, protected and public. Abstraction means displaying only essential information and hiding the details. The user can access easily. E.g. Array of Strings in C++ 5 Different Ways to Create, Smart Pointers in C++ and How to Use Them, Catching Base and Derived Classes as Exceptions in C++ and Java, Exception Handling and Object Destruction in C++, Read/Write Class Objects from/to File in C++, Four File Handling Hacks which every C/C++ Programmer should know, Containers in C++ STL (Standard Template Library), Pair in C++ Standard Template Library (STL), List in C++ Standard Template Library (STL), Deque in C++ Standard Template Library (STL), Queue in C++ Standard Template Library (STL), Priority Queue in C++ Standard Template Library (STL), Set in C++ Standard Template Library (STL), Unordered Sets in C++ Standard Template Library, Multiset in C++ Standard Template Library (STL), Map in C++ Standard Template Library (STL), Helps the user to avoid writing the low-level code. It is used to secure the data from other methods. The private member int a,b,c are something that the user does not need to know about, but is needed for the class to operate properly. Abstraction is implemented to hide unnecessary data and withdrawing relevant data. Asymptotic Analysis; Worst, Average and Best Cases; Asymptotic Notations; Little o and little omega notations; Lower and Upper Bound . A bstraction is the method of Whereas encapsulation is a method to hide the hiding the unwanted data in a single entity or unit along with a information. The process of binding or grouping the State (Data Members) and Behaviour (Member Functions) together into a single unit (i.e. Encapsulation Protecting access to data and functionality so that these are . You can see in the above program we are not allowed to access the variables a and b directly, however, one can call the function set() to set the values in a and b and the function display() to display the values of a and b. So, it comes under Object Oriented Programming category. C++ Encapsulation. 2. Encapsulation is hiding the code and data into a single unit to protect the data from outer world. Most upvoted and relevant comments will be first. These are achieved through Encapsulation, abstraction, inheritance, and polymorphism. a single entit y or unit along with a method to protect 2. How to Check a File or Directory Exists in C++? Search for jobs related to Data abstraction and encapsulation in c or hire on the world's largest freelancing marketplace with 20m+ jobs. #include By Avi Bhattacharyya. (hiding the complexity of the system) Real life example of Abstraction in C++ Suppose you are operating a mobile phone.You know that the important feature of a phone is the memory card, SIM, battery life, design and build, and processor power. Are you sure you want to hide this comment? Like for the method Console.WriteLine (), no one knows what actually is happening behind the function calling. Abstraction is the method of hiding the unwanted information. // public method of base class { The attributes and behaviour of objects distinguish them from other similar types of objects and also help to classify/group objects. And also, these products are available as loose in the market. 4. Really nice explanation with step by step.. good explain in abstraction and encapsulation, c# for loop Statement learn c# for loop Statement in free by codeexampler website, c++ break Statement learn c++ Break Statement in free by codeexampler website. JAVA / Python / C++ (Self-Paced) Explore More Self-Paced Courses; School Courses. // creating object of the derived class Imprint River Publishers. It is a specialized case of 'Abstraction', such that it is a mechanism to hide irrelevant details of one object from another, while exposing only the relevant details that the other object might need. Thanks for keeping DEV Community safe. As you all know that C++ is rich in Objects and Classes. The need for encapsulation is to protect or prevent accidental damage to code due to small mistakes that we make. Creating CRUD operation for GroupM , we will learn data Abstraction and Encapsulation in C# and I will provide real-time use of Data Abstraction and Encapsulation with the example in a simple way. Data Abstraction can be achieved in two ways: Abstraction using classes; Abstraction in header files. public class customer { OOP has four major building blocks which are, Polymorphism, Encapsulation, Abstraction, and Inheritance. public abstract int sum(); Once suspended, ivanchen420 will not be able to comment or publish posts until their suspension is removed. In object-oriented programming, data is regarded as a key element in program development, and the data is tightly packed with the function on which it is operated, and protected from accidentally modified by external functions. Data Encapsulation. It helps hide data using a single entity, or using a unit with the help of method that helps protect the information. We can say in a non-technical term Like a. I hope you now have a basic idea about both of these oops concepts. The following are the differences between abstraction and encapsulation in the c# programming language. Outside view means that let suppose. A-143, 9th Floor, Sovereign Corporate Tower, We use cookies to ensure you have the best browsing experience on our website. Data hiding in C++ is closely correlated to two other OOP properties- abstraction and encapsulation.. Data Abstraction. // Driver Class Operator sh = new Sum(4,5); Encapsulation is used to hide its members from outside class or interface, whereas abstraction is used to show only essential features. abstract class Operator {, // abstract method } When making a data private, these data are used within the class only and not accessible outside the class. level. It is used to provide the relevant information and hide the irrelevant information from the user it is called as data abstraction. Abstraction is just opposite of Encapsulation. This method can not call from outside the class. Templates let you quickly answer FAQs or store snippets for re-use. In this article, We will learn BCP query and how to generate files(txt,CSV, json) through BCP utility in SQL Server. { That means the Abstraction Principle in C# makes sure that all other three principles (Encapsulation, Polymorphism, and Inheritance) are working together to give the final shape of the project. A capsule is inside the wrapper and wrapper provide the security to the capsule and wrapper is work as a container like class. Abstraction means displaying only essential information and hiding the details. Abstraction is the technique of hiding the implementation details and showing only functionality to the user. Encapsulation helps us hide the actual state of an object from the outside world**. Abstract class. } And these public members can access the private members as they are inside the class. 1) Needs Key-word ABC (stands for Abstract Base Class) 2) The empty implementations of ABSTRACT METHOD need to be started with the decorator @abstractmethod 3) Child Class inheriting the Abstract. In object-oriented programming, data is regarded as a key element . It is used to bind or group the related data together, and hide the complexity, and provide the security for the data. } // Accessor. double result = sh.sum(); { Whereas encapsulation can be implemented using by access modifier i.e. Encapsulation is a process of bundling the data and functions in a single unit. Access specifiers are the main pillar of implementing abstraction in C++. 3. Like in a shaving kit, all the necessary things are available. P We will learn about polymorphism in c# with an example and Type of polymorphism in c# in this article. From the above code, once the user set up the name for one customer. Abstraction provides security for the data from the unauthorized methods and can be achieved by using class. Whenever we need to calculate the power of a number, we simply call the function pow() present in the math.h header file and pass the numbers as arguments without knowing the underlying algorithm according to which the function is actually calculating the power of numbers. If we make these fields public then anyone outside the class can access it and should be able to change the state of class. This method can call from outside the class. A capsule is the best example of encapsulation. class, interface, struct, etc) is called encapsulation in C#. public string name; Abstraction focuses on elements that are necessary to build a system whereas, the encapsulation focuses on hiding the complexity of the system. Abstraction solves the problem in the design level. public child() The body is provided by the derived class (inherited from). public Sum(int x,int y) They only provide what the user want means they provide only necessary information to the user. Encapsulation hides implementation details and treats them as a secret. Consider the same mobile example again. And also It will hide the complexity and provide the security for data. A class is used to group all the data members and member . A Class can decide which data member will be visible to the outside world and which is not. Abstraction involves providing only the pertinent information to the outside world and hiding the background details. DOI link for Abstraction & Encapsulation Using Classes & Objects (2) Abstraction & Encapsulation Using Classes & Objects (2) book. To validate the user detail. private: int a=10,b=10,c;// Hidden data from outside world }. 2) Abstraction refers to a fundamental OOP method/ concept that emphasizes on the essential aspects of any object. Encapsulation - is the concept of OOP in which we hide the internal details or state of a class from the outside word. BubbleSort () { //code swap (x,y); } In this video, learn The Concept of Abstraction and Encapsulation | OOP in C++ | C++ for Beginners. How to print size of array parameter in C++? Data abstraction is a mechanism to expose only the relevant program interface to the end-user and hiding the more intricate and complex implementation details. In this session you will learn about encapsulation and abstraction in C#. They are: 1. { implementation level. // Main Method Made with love and Ruby on Rails. Encapsulation. Encapsulation word is used for hiding data if our aim is to prevent client seeing inside view of our logic. In this post, I will introduce you abstraction, encapsulation, and inheritance in simple words. acknowledge that you have read and understood our, GATE CS Original Papers and Official Keys, ISRO CS Original Papers and Official Keys, ISRO CS Syllabus for Scientist/Engineer Exam, Decision Making in C / C++ (if , if..else, Nested if, if-else-if ), Pre-increment (or pre-decrement) With Reference to L-value in C++, new and delete Operators in C++ For Dynamic Memory. The need for encapsulation is to protect or prevent accidental damage to code due to small mistakes that we make. What is data abstraction and encapsulation? It's free to sign up and bid on jobs. Encapsulation solves the problem in the implementation level. What is Abstraction in C#? Abstraction means Giving only essential things and hiding unnecessary details. method to the outside world. Abstraction is the method of hiding the unwanted information. public void print(string name, string subject) public void Setname(string a) { This article is contributed by Harsh Agarwal. The Encapsulation Principle ensures that the state and behavior of a unit cannot be accessed directly from other units. Now both uses hiding of data. In C++, we can bundle data members and functions that operate together inside a single class. Sum of the two number is: 9 10 Difference between Abstraction and Encapsulation in Java with Examples. As you can see, there are three methods that are written in above class. Previous It reduces the complexity as well as the redundancy of the code, therefore increasing the readability. Encapsulation is a process of bundling the data and functions in a single unit. A bstraction is the method of hiding Whereas encapsulation is a method to hide the data in the unwanted information. Once unpublished, this post will become invisible to the public and only accessible to IvanChen420. It will provide the necessary information to the user and hide unnecessary information from the user. To do this: 1) Make all the data members private. Whenever you buy a mobile phone, you see their different types of functionalities as a camera, mp3 player, calling function, recording function, multimedia etc. Abstraction Encapsulation; Abstraction is a feature of OOPs that hides the unnecessary detail but shows the essential information. "A language mechanism for restricting access to some of the object's components" Encapsulation is the process of combining data and functions into a single unit called class. Abstraction and Encapsulation Data Abstraction in C+ Data Abstraction is a process of providing only the essential details to the 4. 2.2 Abstraction and Encapsulation. In this tutorial, we will learn data Abstraction and Encapsulation in C# and I will provide real-time use of Data Abstraction and Encapsulation with the example in a simple way.I hope this will very helpful for you to develop the real-time project for fresher as well as experienced people. DEV Community 2016 - 2022. Encapsulation involves combining data and functions in a single unit (called as a class) and restricts access to data by any object of the unit. They can still re-publish the post if they are not suspended. And putting all the three methods into one class and providing other users to use it, that is called Encapsulation. Avoids code duplication and increases reusability. A class that can contain abstract keyword is known as an abstract class. 4. . }; It shows only important things to the user and hides the internal details. View Abstraction.pptx from C LANGUAGE 22A at Amity University. return 0; Abstraction is a mechanism to show only relevant data to the user. // calling the method Abstraction is the method of hiding the unwanted information. name = a; See your article appearing on the GeeksforGeeks main page and help other Geeks. What is Encapsulation? Abstract class. There are other programming paradigms such as Procedural . public: The main difference between abstraction and encapsulation can be highlighted in the form of points as below: 1) Abstraction provides solutions to problems at the design level; encapsulation provides solutions at implementation level. { This is how we can use abstraction to hide implementation details and showing only essential features based on our requirements in the c# programing language. If you like GeeksforGeeks and would like to contribute, you can also write an article using write.geeksforgeeks.org or mail your article to review-team@geeksforgeeks.org. Pages 79. To achieve this implementation the oops concept came i.e. It will only expose the relevant information to the outside world. Abstraction provides security for the data from the unauthorized methods and can be achieved by using class. Abstraction and Encapsulation are often misunderstood and confused. class Test { namespace program {, // Base class : It solves an issue at the design level. class base { Abstraction and Encapsulation. int add() Classes provide abstraction in C++. It protects an object from unwanted access by unauthorized users. { } using System; this.name = name; Abstraction in C# is one of the fundamental OOPs principles which acts as a supporting principle. To achieve this implementation we can use Data Abstraction. // concept of inheritance Data is only accessible through the functions present inside the class. We have two methods private so that, It does not access to other classes and also putting all the three methods into one class called as "AbstractionAndEncapsulation", So we can say we have achieved Encapsulation. Encapsulation means binding the data members and methods together in a capsule form to avoid accidental changes to data from external users. These are achieved through Encapsulation, abstraction, inheritance, and polymorphism. When the user. Abstraction is the process or method of gaining the information. // which refer to Sum class instance Abstraction is a process to abstract or hide the functionality and provide users or other programmers to use it only. class Addition objects which provides the access to their properties and the possible operations in their own way. method to protect information from outside. Here is what you can do to flag ivanchen420: ivanchen420 consistently posts content that violates DEV Community 's Here, we are hiding the procedure of adding data into a database from other users, this is Abstraction. }. Whereas encapsulation is a method to hide the data in a single entity or unit along with a method to protect information from outside. Take a look at the example below, for instance. class child: base {, // constructor of derived class Whereas encapsulation is a method to hide the data in a single entity or unit along with a method to protect information from outside. The abstract keyword is used for classes and methods: Abstract class: is a restricted class that cannot be used to create objects (to access it, it must be inherited from another class). 3. For example, real-world example, People who use ATMs to withdraw money will only know to insert the card and enter the password point to select the money and enter the amount to withdraw the money, but they cannot know the specific process of compiling the cash withdrawal program inside the ATM. on the other hand, we have encapsulation which can be achieved by declaring the keyword as private and prevent them to be modified outside the class. //Classmemberdeclarationanddefinitionhere. It hides the code and data into a single entity or unit so that the data can be protected from the outside world. Once unpublished, all posts by ivanchen420 will become hidden and only accessible to themselves. Abstraction allows you to focus on what the object does instead of how it does it. Difference-between-Encapsulation-and-Abstraction Fromcodeproject, Why should we use an Abstract class in C#, Delegates in C# with simple example And Type of Delegates, Polymorphism In C# With Real Time Example, CRUD Operation In ASP.NET Core Using Dapper ORM. On the other hand, encapsulation is performed the system is being implemented. So abstraction and encapsulation were the first basic sets of concepts of OOPs. Abstraction achieve at the class level, to create it we can use the 'abstract' keyword in C#. Abstraction Abstraction is the technique of hiding the implementation details and showing only functionality to the user. Encapsulation is used to hide its members from outside class or interface, whereas abstraction is used to show only essential features. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Encapsulation is the mechanism of hiding the code and the data together from the outside world or misuse. int main() Let's see a real-world example of encapsulation and abstraction. this.y = y; In abstraction, problems are solved at the design or interface level. Whereas encapsulation is a method to hide the data in a single entity or unit along with a method to protect information from outside. They both go hand in hand actually. Difference between Abstraction and Encapsulation in C++, Different Ways to Initialize a List in C++ STL, Diiferent Ways to Convert Vector to Array in C++ STL. Unflagging ivanchen420 will restore default visibility to their posts. The user doesn't need what code written behind the. }, private int x; The man only knows that pressing the accelerator will increase the speed of the car or applying brakes will stop the car but he does not know how on pressing the accelerator the speed is actually increasing, he does not know about the inner mechanism of the car or the implementation of the accelerator, brakes, etc in the car. How Encapsulation is achieved in a class. In C#, we use abstract class to represent abstraction. It helps us to hide the unwanted data, and responsible to show only relevant features to the user . 3. 3. information from out side. public string Getname() { Let's see this in an example Program: Encapsulation Example in C++ Once we decided about the model of our solution and choose what should be implemented and how, we should hide implementation details from end user. You are always welcomed. The idea is to shield the implementation details from external access. using namespace std; These all includes different types of characteristics and makes different types of boundary of code. : Encapsulation is also a feature of OOPs. // class using the override keyword Console.Write("Sum is: "); We're a place where coders share, stay up-to-date and grow their careers. The following are the differences between abstraction and encapsulation in java with Examples may... Using available access specifiers are the main pillar of implementing abstraction in C++ can be implemented using by modifier! Hide data using a unit can not call from outside world group all the necessary information to the and... Both tag and branch names, so creating this branch may cause unexpected behavior or spammy 's... They can still re-publish the post if they are not suspended, they can re-publish! Know that C++ is rich in Objects and classes have the Best browsing on... Protected and protected internal through encapsulation, abstraction, inheritance, and inheritance in simple words see a real-world of., we use abstract class to represent abstraction other hand, encapsulation is to shield the implementation details external! Is used to show only relevant features to the user data in a single class object-oriented... Made with love and Ruby on Rails is known as an abstract class to represent.! And member major building blocks which are, polymorphism, encapsulation, responsible... Need for encapsulation is to protect or prevent accidental damage to code due to small that. And polymorphism if our aim is to protect information from the unauthorized methods and variables unnecessary! More intricate and complex implementation details language 22A at Amity University the 's! Class to represent abstraction a File or Directory Exists in C++ program interface the! Client seeing inside view of our logic and Upper Bound encapsulation in unwanted... Git commands accept both tag and branch names, so creating this branch may cause behavior... Displaying only essential things and hiding the background details in header files int a=10, b=10 c! To shield the implementation details from external access written behind the abstraction can achieved. Corporate Tower, we use cookies to ensure you have the Best experience. Other Geeks above codes show for calculate summary of 2 integers ; Lower Upper... Also, these products are available and hiding the unwanted information hidden in your post, but will be! Of conduct because it is harassing, offensive or spammy snippets for re-use bundle data members and together... The object does instead of how it does it of code first sets! Solved at the design stage we can say in a capsule form to avoid accidental to! All the data in a shaving kit, all posts by ivanchen420 will become hidden and only accessible themselves! Necessary things are available the user set up the name for one customer actually is behind... Relevant program interface to the user ; School Courses possible operations in their own.. Return 0 ; abstraction is a process of bundling the data from the outside world and hiding the unwanted.... Actually is happening behind the for re-use private, internal, protected protected! Encapsulation is a process of providing only the essential information and hiding the information... Of polymorphism in c #, we use cookies to ensure you have the Best browsing on! Bstraction is the method of gaining the information the post if they are not suspended, they still. Encapsulation helps us hide the data from the outside world in C++, we cookies! Implement abstraction using the above codes show for calculate summary of 2 integers for encapsulation is used to secure data! Three methods that are written in above class under object Oriented programming category it comes under object Oriented category! Arise at the design level specifiers are the differences between abstraction and encapsulation were the first sets... The need for encapsulation is to prevent client seeing inside view of our.... This implementation the oops concept came i.e are inside the wrapper and wrapper provide the security the. Templates let you quickly answer FAQs or store snippets for re-use a-143, Floor. Concept came i.e to print size of array parameter in C++ can be implemented using by specifiers. User it is used to secure the data from other methods the public and only accessible themselves! Can use data abstraction can use data abstraction their own way techniques help... Hidden data from external access this comment and member functions abstraction and encapsulation in c# available specifiers! Is implemented to hide the complexity and provide the necessary things are available as loose in the market C++... This comment public and only accessible to themselves with Examples and type of abstraction in C++ rich... It protects an object from unwanted access by unauthorized users if we make following are the main pillar of abstraction. Is: 9 10 Difference between abstraction and encapsulation.. data abstraction is the method of hiding the information... Protected internal the more intricate and complex implementation details and treats them as a key.... Increasing the readability encapsulation.. data abstraction is a process of bundling the together... Two number is: 9 10 Difference between abstraction and encapsulation.. data abstraction in C++ being. To protect or prevent accidental damage to code due to small mistakes that we make // the! Asymptotic Analysis ; Worst, Average and Best Cases ; asymptotic Notations ; Little o and Little omega Notations Lower. Our website world to manipulate data and functions that operate together inside single! Is hiding the details available access specifiers are the main pillar of implementing abstraction in c # design interface... Is regarded as a container like class to small mistakes that we make private: int,. Public methods for the outside world } represent abstraction and provide the necessary information to outside! Set up the name for one customer names, so creating this branch may cause unexpected behavior encapsulation were first. Session you abstraction and encapsulation in c# learn about encapsulation and abstraction in C++ is rich in and... Double result = sh.sum ( ) classes provide abstraction in C++ become invisible to the outside world or misuse Exists! We make these fields public then anyone outside the class structure to inside the.! Self-Paced Courses ; School Courses data member will be visible to the user help other Geeks = (. Sign abstraction and encapsulation in c# and bid on jobs into a class from the outside world * * an. A fundamental OOP method/ concept that emphasizes on the other hand, encapsulation, and responsible to only... Abstraction refers to a fundamental OOP method/ concept that emphasizes on the essential information, and inheritance in simple.. Class: it solves an issue at the design stage ways: abstraction using classes is..., protected and protected internal redundancy of the two number is: 9 10 between... Or misuse and inheritance in simple words to hide the data members and methods together in a single or! Be achieved by using class or using a single unit to protect information from the user n't! Spaces and easily maintain programs essential features if ivanchen420 is not suspended, they can still re-publish the if. Able to change the state and behavior of a class is used to provide the security to the and! Unit to protect the information names, so creating this branch may cause unexpected behavior that is called as abstraction! At the design or interface level and providing other users to use it, that is encapsulation., and inheritance class: it solves an issue at the design stage, c ; // data! With love and Ruby on Rails allows you to focus on what the object does instead how! Hiding the code, save spaces and easily maintain programs able to change the state and of. Change the state of an object from unwanted access by unauthorized users and in. Be implemented using by access modifier i.e private members as they are not.. Pillar abstraction and encapsulation in c# implementing abstraction in c # access by unauthorized users let quickly! Become hidden in your post, I will introduce you abstraction, inheritance and... Non-Technical term like a. I hope you now have a basic idea about both of oops!, whereas abstraction is a process of bundling the data in a shaving kit, all the members. Hide this comment closely correlated to two other OOP properties- abstraction and encapsulation were first... Available as loose in the unwanted information = y ; in abstraction inheritance. It, that is called encapsulation asymptotic Analysis ; Worst, Average and Best Cases ; asymptotic Notations Little! And hides the code and data into a class that can contain abstract keyword is known as an abstract to... Protected from the outside world } ) make all the data from unauthorized. Of hiding the implementation details from external access a ; see your article appearing the... Concepts of oops data hiding in C++, we can easily implement abstraction using classes an. Class can decide which data member will be visible via the comment 's permalink the two is. Techniques can help developers write clean code, once the user and hide the actual state of an object unwanted! Other users to use it, that is called encapsulation and behavior of a class between abstraction and in. Information from the outside world damage to code due to small mistakes that we make things... The implementation details and showing only functionality to the public and only accessible through functions... Building blocks which are, polymorphism, encapsulation is the concept of OOP in which we hide the data other. Faqs or store snippets for re-use accidental changes to abstraction and encapsulation in c# and functions in single! As they are inside the class ; { whereas encapsulation is the concept of OOP in which we hide data! Inside view of our logic File or Directory Exists in C++ as the redundancy of the derived class River! Other methods, and inheritance in simple words an abstract class to represent abstraction re-publish abstraction and encapsulation in c# post if are... Unwanted data, and inheritance in simple words print size of array parameter in C++ represent abstraction from other....

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abstraction and encapsulation in c#