C#

Ha lee wrote:

there's only one person in the room with some problem who sends me messages with different names, sometimes with crab, fly etc.

'AbstractChild.Child.GetInt()' hides inherited member 
'AbstractChild.AbstractChild.GetInt()'. 
To make the current member override that implementation,
 add the override keyword. Otherwise add the new keyword.

public abstract class Base {
  public int GetInt() {
    return 1;
  }
}

public abstract class AbstractChild : Base {
  // new: completely replace the base class method
  // abstract: inheritors must implement the method
  public new abstract int GetInt();
}

public class Child : AbstractChild {
  // override: implement an abstract method
  public override int GetInt() {
    return 2;
  }
}

Base b = new Child();
Console.Out.WriteLine(b.GetInt());// prints 1

public abstract class Base {
  // virtual: method can be overridden
  public virtual int GetInt() {
    return 1;
  }
}

public abstract class AbstractChild : Base {
  // override the base class method
  // abstract: inheritors must implement this method
  public override abstract int GetInt();
}

public class Child : AbstractChild {
  // override: implement an abstract method
  public override int GetInt() {
    return 2;
  }
}

class Program {
  static void Main(string[] args) {
    Base c = new Child();
    Console.WriteLine(c.GetInt());
    Console.ReadLine();
  }
}

Maysam Mahfouzi wrote:

I didn't know that a method with override modifier can have no body.

public CardDetail MyCardDetail;

//constructor
public NewOrder()
{
    MyCardDetail = new CardDetail();
    MyCardDetail.CardFirstName = "Horace";
    MyCardDetail.CardLastName = "Horsecollar";
    MyCardDetail.CardNumber = "1ABC23";
}

using System;
using System.IO;
using System.Xml.Serialization;
using System.Data;
using System.Web;
using System.Collections;
using System.Web.Services;
using System.Web.Services.Protocols;
using System.ComponentModel;
using ExampleforCodeProject;

namespace ExampleforCodeProject
{

    [WebService(Namespace = "http://MyXmlTest/")]
    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
    [ToolboxItem(false)]
    public class Order : System.Web.Services.WebService
    {

        [WebMethod]
        public NewOrder SerialiseOrder()
        {
            NewOrder order1 = new NewOrder();



            order1.AccountGroup = "11";
            order1.AccountNumber = "878";
            order1.Card.CardFirstName = "George";
            order1.Card.CardLastName = "Balden";
            order1.Card.CardNumber = "872947924793274";



            Stream stream = File.Open("C:\\test\\NewSoap.xml", FileMode.Create); //Create a file
            XmlSerializer sf = new XmlSerializer(typeof(NewOrder)); //
            sf.Serialize(stream, order1); //serialise
            stream.Close();
            return order1;
        }
    }
}

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using ExampleforCodeProject; 

namespace ExampleforCodeProject
{
    [Serializable]
    public class NewOrder
    {

        public NewOrder() { } //constructor
        ~NewOrder() { } //Destructor

        private string accountGroupfield;
        private string accountNumberfield;

        public string AccountGroup
        {
            get
            {
                return accountGroupfield;
            }
            set
            {
                accountGroupfield = value;
            }
        }

        public string AccountNumber
        {
            get
            {
                return accountNumberfield;
            }
            set
            {
                accountNumberfield = value;
            }
        }

        public CardDetail Card;

        [Serializable]
        public class CardDetail
        {

            private string cardFirstNamefield;
            private string cardLastNamefield;
            private string cardNumberfield;

            public string CardFirstName
            {
                get
                {
                    return cardFirstNamefield;
                }
                set
                {
                    cardFirstNamefield = value;
                }
            }

            public string CardLastName
            {
                get
                {
                    return cardLastNamefield;
                }
                set
                {
                    cardLastNamefield = value;
                }
            }

            public string CardNumber
            {
                get
                {
                    return cardNumberfield;
                }
                set
                {
                    cardNumberfield = value;
                }
            }
        }
    }
}