What is the difference between objects and classes in C#?

Like Java, C# also has objects and classes. Objects are real-world entities and instances of classes. Use objects to access members of a class.

To access class members, you need to use the dot (.) operator after the object name. The dot operator links the name of the object with the name of the member, for example,

Box Box1 = new Box();

Above you can see that Box1 is our object. We will use this to access members.

Box1.height = 3.0;

You can also use it to call member functions.

Box1.getVolume();

The following examples show how objects and classes work in C#.

Example

Real-time demonstration

using System;

namespace BoxApplication {
   class Box {
      private double length; // Length of a box
      private double breadth; // Breadth of a box
      private double height; // Height of a box

      public void setLength( double len ) {
         length = len;
      }

      public void setBreadth( double bre ) {
         breadth = bre;
      }

      public void setHeight( double hei ) {
         height = hei;
      }

      public double getVolume() {
         return length * breadth * height;
      }
   }

   class Boxtester {
      static void Main(string[] args) {
         // Creating two objects
         Box Box1 = new Box(); // Declare Box1 of type Box
         Box Box2 = new Box();
         double volume;

         // using objects to call the member functions
         Box1.setLength(6.0);
         Box1.setBreadth(7.0);
         Box1.setHeight(5.0);

         // box 2 specification
         Box2.setLength(12.0);
         Box2.setBreadth(13.0);
         Box2.setHeight(10.0);

         // volume of box 1
         volume = Box1.getVolume();
         Console.WriteLine("Volume of Box1 : {0}" ,volume);

         // volume of box 2
         volume = Box2.getVolume();
         Console.WriteLine("Volume of Box2 : {0}", volume);

         Console.ReadKey();
      }
   }
}

Output

Volume of Box1 : 210
Volume of Box2 : 1560

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