Brief Lesson About C# Classes And Objects

Synopsis

Introduction
Definition
Class Description
Object Description
Accessing Class Prosperities using Object
Conclusion

Introduction

This article explains about class and object in a detailedway. It is common for all programming Languages except for syntax. Concept wise all are same way for all programming languages.

Definition

Class is a collection of member data and member function or member method, which means collection of variables and methods.

Object is a run time entity that is used to access class variables and methods.

Class and Object Description

Class is a structure of memory allocation method of programming languages. It is the same for all programming Languages. Class has the different data type of variables and methods. It is used to manipulate data with protected way. We can manipulate data without class but it is not a protected way and it is not a fast accessing way.

Class is a raw data, without object it is not complete full structure.

Real time Example
example
Explanation

Above diagram explains about class and object. If you need to make a brick you need the raw material as well as the shape. Without raw material or shape we could not make a brick, both are very important.

Class is a like raw material and object is a like shape. Without object cannot access class as well as without class could not create object both are very important.

example
Class Syntax

Using “class” Keyword to creates class. Class has following structure.

Class Syntax
Using “class” Keyword to creates class. Class has following structure.
class class_name
{
//member variable and member function.
}

Example

Public class Sample
{
public int Rno;
public string Name;
}

Classes have good security method while accessing class variables and methods with the help of object. Accesses specifier or modifier used to secure access in class. One of the main advances of class is security. Before discovering the class do not having good secured access.

The following diagram explains about memory allocations for above class.
example

Object Creation

Object is a runtime entity. It is used to access class proprieties. Creating objects following way.

static void Main(string[] args)
{
Sample ss = new Sample(); // Object Creation
}

Access Class Prosperities

Accessing class prosperities using object in following way.

public class Sample
{
public int Rno;
public string Name;
}
class Program
{
static void Main(string[] args)
{
Sample ss = new Sample();
ss.Rno = 1001;
ss.Name = "Demo"; // Accessing Class Properities Using Object
}
}

Example Program

namespace OopsFirstClass
{
public class Sample
{
public int Rno;
public string Name;
}
class Program
{
static void Main(string[] args)
{
Sample ss = new Sample();
ss.Rno = 1001;
ss.Name = "Demo";
Sample ss1 = new Sample();
ss1.Rno = 1002;
ss1.Name = "Finish Deom";
Console.WriteLine("Rno:" + ss.Rno);
Console.WriteLine("Name:" + ss.Name);
Console.WriteLine("Rno:"+ ss1.Rno);
Console.WriteLine("Name:" + ss1.Name);
Console.Read();
}
}
}

Conclusion

This article helps those who are learning OOPS concepts newly as well as students. Next part of article explains about the next topic of oops concept.

8 Comments

Join the conversation! Your thoughts help the community grow.

Subash10y ago
Super
Anu V10y ago
Nice bro..
Shobana J10y ago
Good one
- Vignesh Mani10y ago
  Thank You Shobana
Hari Krishnan Velayutham10y ago
Nice vicky
Manivannan P10y ago
Ya, Good Vignesh. Still i will expect advance concepts in Oops.
- Vignesh Mani10y ago
  Sure Sir.
Pritam Zope10y ago
Nice..