Example.

Class Diagram :-

 

using System; using System.Collections.Generic; using System.Linq; using System.Text; //Design a class to accept ElectricBill customer details and calculate and print Electricity Bill namespace CAClasses {     class ClsEBill     {         int CNumber, PrvRead, PressRead, Units;         double Price;         public void GetCData()         {             Console.WriteLine("Enter Customer Details of Electric Bill");             Console.WriteLine("Enter Customer Number");             this.CNumber = Convert.ToInt32(Console.ReadLine());             Console.WriteLine("Enter Previous Reading");             this.PrvRead = Convert.ToInt32(Console.ReadLine());             Console.WriteLine("Enter Present Reading");             this.PressRead = Convert.ToInt32(Console.ReadLine());         }         public void Calculate()         {             this.Units = this.PressRead - this.PrvRead;             this.Price = 4* this.Units;         }         public void DisplayCData()         {             Console.WriteLine("Customer number is      " + this.CNumber);             Console.WriteLine("PrvRead is              " + this.PrvRead);             Console.WriteLine("Presents Reading is     " + this.PressRead);             Console.WriteLine("Units are               " + this.Units);             Console.WriteLine("price is                " + this.Price);         }     }     class ClsExample3     {         static void Main()         {             ClsEBill Obj1 = new ClsEBill();             Obj1.GetCData();             Obj1.Calculate();             Obj1.DisplayCData();             Console.ReadLine();         }     } }

Output :-