Class in C#

Blueprint for a data type is what you can call a class in C#. Objects are instances of a class. The methods and variables that constitute a class are called members of the class.

Example

The following is the general form of a class in C# −

<access specifier> class class_name {
   // member variables
   <access specifier><data type> variable1;
   <access specifier><data type> variable2;
   ...
   <access specifier><data type> variableN;
   // member methods
   <access specifier><return type> method1(parameter_list) {
      // method body
   }
   <access specifier><return type> method2(parameter_list) {
      // method body
   }
   ...
   <access specifier><return type> methodN(parameter_list) {
      // method body
   }
}

Let us see an example to learn how to create a class in C# −

Example

using System;

namespace Demo {
   class Box {
      public double length; // Length of a box
      public double breadth; // Breadth of a box
      public double height; // Height of a box
   }

   class Boxtester {
      static void Main(string[] args) {
         Box Box1 = new Box(); // Declare Box1 of type Box
         Box Box2 = new Box(); // Declare Box2 of type Box
         double volume = 0.0; // Store the volume of a box here

         // box 1 specification
         Box1.height = 5.0;
         Box1.length = 6.0;
         Box1.breadth = 7.0;

         // box 2 specification
         Box2.height = 10.0;
         Box2.length = 12.0;
         Box2.breadth = 13.0;

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

         // volume of box 2
         volume = Box2.height * Box2.length * Box2.breadth;
         Console.WriteLine("Volume of Box2 : {0}", volume);
         Console.ReadKey();
      }
   }
}

Output

Volume of Box1 : 210
Volume of Box2 : 1560