Notes

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

namespace Bridge
{
class Program
{
static void Main(string[] args)
{



}
}

interface IDataObject<T>
{
void NextRec();
void PriorRex();
void AddRec(T t);
void DeleteRec(T t);
void GetCurrentRec();
void ShowRec();
void ShowAllRec();
}

class CustomerData : IDataObject<string>
{
public string City { get; set; }
private int _current = 1;
private List<string> _customers;
public CustomerData()
{
_customers = new List<string>
{
"Ahmet","Batuhan"
};
}
public void AddRec(string t)
{
_customers.Add(t);
}

public void DeleteRec(string t)
{
_customers.Remove(t);
}

public void GetCurrentRec()
{
return _customers[_current];
}

public void NextRec()
{
if (_current<= _customers.Count -1)
{
_current++;
}
}

public void PriorRex()
{
if (_current >0)
{
_current--;
}
}

public void ShowAllRec()
{
Console.WriteLine("City:{0}", City);
_customers.ForEach(c => Console.WriteLine(""+c));
}

public void ShowRec()
{
throw new NotImplementedException();
}
}

class CustomerBase
{
public IDataObject<string> DataObject { get; set; }
public virtual void Add(string name)
{
DataObject.AddRec(name);
}
public virtual void Delete(string name)
{
DataObject.DeleteRec(name);
}
public virtual void Next()
{
DataObject.NextRec();
}
public virtual void Prior()
{
DataObject.PriorRex();
}
public virtual void Show()
{
DataObject.ShowRec();
}
public virtual void ShowAll()
{
DataObject.ShowAllRec();
}

}
}