/*
C#: The Complete Reference 
by Herbert Schildt 

Publisher: Osborne/McGraw-Hill (March 8, 2002)
ISBN: 0072134852
*/


// Call a hidden method. 
 
using System; 
 
class A { 
  public int i = 0; 
 
  // show() in A 
  public void show() { 
    Console.WriteLine("i in base class: " + i); 
  } 
} 
 
// Create a derived class. 
class B : A { 
  new int i; // this i hides the i in A 
 
  public B(int a, int b) { 
    base.i = a; // this uncovers the i in A 
    i = b; // i in B 
  } 

  // This hides show() in A. Notice the use of new. 
  new public void show() { 
    base.show(); // this calls show() in A 
 
    // this displays the i in B 
    Console.WriteLine("i in derived class: " + i); 
  } 
} 
 
public class UncoverName123 { 
  public static void Main() { 
    B ob = new B(1, 2); 
 
    ob.show(); 
  } 
}


           
          

   

/*
C#: The Complete Reference 
by Herbert Schildt 

Publisher: Osborne/McGraw-Hill (March 8, 2002)
ISBN: 0072134852
*/


// Using base to overcome name hiding. 
 
using System; 
 
class A { 
  public int i = 0; 
} 
 
// Create a derived class. 
class B : A { 
  new int i; // this i hides the i in A 
 
  public B(int a, int b) { 
    base.i = a; // this uncovers the i in A 
    i = b; // i in B 
  } 
 
  public void show() { 
    // this displays the i in A. 
    Console.WriteLine("i in base class: " + base.i); 
 
    // this displays the i in B 
    Console.WriteLine("i in derived class: " + i); 
  } 
} 
 
public class UncoverName1231 { 
  public static void Main() { 
    B ob = new B(1, 2); 
 
    ob.show(); 
  } 
}


           
          

   

/*
C#: The Complete Reference 
by Herbert Schildt 

Publisher: Osborne/McGraw-Hill (March 8, 2002)
ISBN: 0072134852
*/


// An example of inheritance-related name hiding. 
 
using System; 
 
class A { 
  public int i = 0; 
} 
 
// Create a derived class. 
class B : A { 
  new int i; // this i hides the i in A 
 
  public B(int b) { 
    i = b; // i in B 
  } 
 
  public void show() { 
    Console.WriteLine("i in derived class: " + i); 
  } 
} 
 
public class NameHiding { 
  public static void Main() { 
    B ob = new B(2); 
 
    ob.show(); 
  } 
}


           
          

   

/*
 * C# Programmers Pocket Consultant
 * Author: Gregory S. MacBeth
 * Email: gmacbeth@comporium.net
 * Create Date: June 27, 2003
 * Last Modified Date:
 */
using System;

namespace Client.Chapter_5___Building_Your_Own_Classes
{
  public class MyMainClass3
  {
    static void Main(string[] args)
    {
      //The function called is based
      //upon the type called by new.
      A MyA = new D();
      B MyB = new C();

      MyA.Display();    //Calls D Display  
      MyB.Display();    //Calls C Display
      // followed by B's Display //via the base keyword
    }
  }
  class A
  {
    public virtual void Display()
    {
      Console.WriteLine("Class A's Display Method");
    }
  }
  class B: A
  {
    public override void Display()
    {
      Console.WriteLine("Class B's Display Method");
    }
  }
  class C: B
  {
    public override void Display()
    {
      Console.WriteLine("Class C's Display Method");
      base.Display();
    }
  }
  class D: C
  {
    public override void Display()
    {
      Console.WriteLine("Class D's Display Method");
    }
  }

}

           
          

   

/*
 * C# Programmers Pocket Consultant
 * Author: Gregory S. MacBeth
 * Email: gmacbeth@comporium.net
 * Create Date: June 27, 2003
 * Last Modified Date:
 */
using System;

namespace Client.Chapter_5___Building_Your_Own_Classes
{
  public class InheritanceChapter_5___Building_Your_Own_Classes
  {
    static void Main(string[] args)
    {
      B MyB = new D();
      D MyD = new D();

      //Both result in in D's instance of Display being //called
      MyB.Display();
      MyD.Display();
    }
  }
  public class B
  {
    public virtual void Display()
    {
      Console.WriteLine("Class B's Display Method");
    }
  }
  public class C: B
  {
    public override void Display()
    {
      Console.WriteLine("Class C's Display Method");
    }
  }
  public class ContainedClass
  {
    int MyInt = 0;
  }
  public class D: C
  {
    public ContainedClass MyClass = new ContainedClass();
    public override void Display()
    {
      Console.WriteLine("Class D's Display Method");
    }
  }

}

           
          

   

/*
C# Programming Tips & Techniques
by Charles Wright, Kris Jamsa

Publisher: Osborne/McGraw-Hill (December 28, 2001)
ISBN: 0072193794
*/

//
//  Access1.cs - demonstrates deriving a new class from a base class in
//               another assembly. Also demonstrates how a derived class
//               may provide a public property to expose a protected member
//               of a base class.
//
//               Compile this program with the following command line:
//                   C:>csc /r:access.exe Access1.cs
//
namespace nsAccess
{
    using System;
    
    public class Access1
    {
        static public void Main ()
        {
            clsDerived derived = new clsDerived ();
            derived.AccessIt = 42;
            derived.ShowField ();
        }
    }
//
// Derive a class from the base class and give it a public
// property to access the private field in the base class
    class clsDerived : clsBase
    {
        public int AccessIt
        {
            get {return (Private);}
            set {Private = value;}
        }
    }
    public class clsBase
    {
        private int m_Private;
        protected int Private
        {
            get {return (m_Private);}
            set {m_Private = value;}
        }
        public void ShowField ()
        {
            Console.WriteLine ("The value of private field m_Private is " + m_Private);
        }
    }
    
}


           
          

   
 

using System;
using System.Collections;


public class Starter {
    public static void Main() {
        Employee obj1 = new Employee(5678);
        Employee obj2 = new Employee(5678);
        if (obj1 == obj2) {
            Console.WriteLine("equals");
        } else {
            Console.WriteLine("not equals");
        }
    }
}

class Employee {

    public Employee(int id) {
        if ((id < 1000) || (id > 9999)) {
            throw new Exception(
                "Invalid Employee ID");
        }

        propID = id;
    }

    public static bool operator ==(Employee obj1, Employee obj2) {
        return obj1.Equals(obj2);
    }

    public static bool operator !=(Employee obj1, Employee obj2) {
        return !obj1.Equals(obj2);

    }

    public override bool Equals(object obj) {
        Employee _obj = obj as Employee;

        if (obj == null) {
            return false;
        }
        return this.GetHashCode() == _obj.GetHashCode();
    }

    public override int GetHashCode() {
        return EmplID;
    }

    public string FullName {
        get {
            return propFirst + " " +
                propLast;
        }
    }

    private string propFirst;
    public string First {
        get {
            return propFirst;
        }
        set {
            propFirst = value;
        }
    }

    private string propLast;
    public string Last {
        get {
            return propLast;
        }
        set {
            propLast = value;
        }
    }

    private readonly int propID;
    public int EmplID {
        get {
            return propID;
        }
    }

    public override string ToString() {
        return FullName;
    }
}