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METHOD HIDING IN C# WITH SAMPLE EXAMPLE

uk365guy
## METHOD HIDING

## INVOKE BASE CLASS MEMBERS

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using ConsoleApplication4;

namespace ConsoleApplication4
{
    public class Employee
    {
        public string FirstName;
        public string LastName;
        public string Email;

        public void PrintFullName()
        {
            Console.WriteLine(FirstName + ” ” + LastName);
        }
    }

    public class PartTimeEmployee : Employee
    {
        public new void PrintFullName()
        {
            Console.WriteLine(FirstName + ” ” + LastName  +  ” — Contractor”);
        }
    }

    public class FullTimeEmployee : Employee
    {

    }
    class Program
    {
        static void Main(string[] args)
        {
           Employee PTE = new PartTimeEmployee();
            PTE.FirstName = “PART TIME “;
            PTE.LastName  =  “EMPLOYEE”;
            PTE.PrintFullName();
            Console.ReadLine();

            FullTimeEmployee FTE = new FullTimeEmployee();
            FTE.FirstName = “FULL TIME”;
            FTE.LastName = “EMPLOYEE”;
            FTE.PrintFullName();
            Console.ReadLine();
        }

    }
}

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INHERITANCE IN C# WITH SAMPLE EXAMPLE

uk365guy
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using ConsoleApplication4;

namespace ConsoleApplication4
{
    /// <summary>
    /// Base class Employee( Inheritance example)
    /// </summary>
    public class Employee
    {
        public string FirstName;
        public string LastName;
        public string Email;
   
        public void PrintFullName()
        {
            Console.WriteLine(FirstName + ” ” + LastName);
        }
    }
    /// <summary>
    /// Derived class inheriting Employee
    /// </summary>
    public class FullTimeEmployee : Employee
    {

      public  float YearlySalary;
    }
    /// <summary>
    /// Derived class inherting Employee
    /// </summary>

    public class PartTimeEmployee :  Employee
    {
     public  float HourlyRate;

    }
    class Program
    {
        static void Main(string[] args)
        {
            FullTimeEmployee FTE = new FullTimeEmployee();
            FTE.FirstName = “Mitali”;
            FTE.LastName = “Gurram”;
            FTE.Email = “malla.gurram@gmail.com”;
            FTE.YearlySalary = 100000;
            FTE.PrintFullName();
            Console.ReadLine();

            PartTimeEmployee PTE = new PartTimeEmployee();
            PTE.FirstName = “GMR”;
            PTE.LastName = “IT SOLUTIONS”;
            PTE.HourlyRate = 90;
            PTE.PrintFullName();
            Console.ReadLine();
        }

    }
}

=============
DERIVED CLASS  CAN CONTROL BASE CLASS CONSTRUCTORS

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using ConsoleApplication4;

namespace ConsoleApplication4
{
    public class ParentClass
    {     //parent constructor
        public ParentClass()
        {
            Console.WriteLine(” parentclass constructor called”);
            Console.ReadLine();
        }
        public ParentClass(string Message)
        {
            Console.WriteLine(Message);
            Console.ReadLine();
        }
    }

    public class ChildClass : ParentClass
    {    //childclass constructor
        public ChildClass() :  base(“Derived class controlling parent class”)
        {
            Console.WriteLine(“childclass constructor called”);
             Console.ReadLine();
        }
    }

   
    class Program
    {
        static void Main(string[] args)
        {
           ChildClass CC = new ChildClass();
           
        }

    }
}

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STATIC AND INSTANCE CLASS MEMBERS

uk365guy
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication4
{

    class Circle
    {
       static float _PI;
        int _Radius;

        static Circle()
        {
            Circle._PI = 3.141F;
        }

        public Circle(int Radius)
        {
            this._Radius = Radius;
        }

        public float CalculateArea()
        {
            return Circle._PI * this._Radius * this._Radius;
        }

    }
    class Program
    {
        static void Main(string[] args)
        {
            Circle C1 = new Circle(5);
            float Area1 = C1.CalculateArea();
            Console.WriteLine(“Area = {0}”, Area1);
            Console.ReadLine();

            Circle C2 = new Circle(6);
            float Area2 = C2.CalculateArea();
            Console.WriteLine(“Area = {0}”, Area2);
            Console.ReadLine();
        }
    }
}

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METHODS

uk365guy
Methods can have attributes, access modifiers, return types, method names, parameters and methods..

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication3
{
    class Program
    {

        static void Main(string[] args)
        {
            Program p = new Program();
            p.EvenNumbers();
            int Sum = p.Add(10, 20);
            Console.WriteLine(“Sum={0}”, Sum);
            Console.ReadLine();
        }

        public int Add(int F ,int L)
        {
            return F + L;
        }
 
        public void EvenNumbers()
        {
            int start = 0;

            while (start <= 20)
            {
                Console.WriteLine(start);
                Console.ReadLine();
                start = start + 2;
             
            }
        }
    }
}
         

================
OUTPUT PARAMETERS
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace ConsoleApplication3
{
    class Program
    {
        static void Main(string[] args)
        {
            int Total = 0;
            int Product = 0;
            Calculate(10, 20, out Total, out Product);
            Console.WriteLine(“sum = {0} && product = {1}”,Total,Product);
            Console.ReadLine();
        }
        public static void Calculate(int FN, int LN, out int sum, out int product)
        {
            sum = FN + LN;
            product = FN * LN;
        }
    }
}
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