Use indexer to add element : Indexer : Class C# Examples

    
using  System;
using  System.Collections;

public  class  MainClass
{
    public  static  void  Main()
    {
        EmployeeList  empList  =  new  EmployeeList();
    
        empList[0]  =  new  Employee("F");
        empList[1]  =  new  Employee("C");
        empList[2]  =  new  Employee("Z");

        for(int  i  =  0;  i  <  empList.GetNumberOfEmployeeList();  i++)
        {
            Console.WriteLine("Employee  number  {0}:",  i);
            Console.WriteLine("Name:  {0}",  empList[i].Name);
        }

        try
        {
            Console.WriteLine("Using  IEnumerable");
            foreach  (Employee  c  in  empList)
            {
                Console.WriteLine("Name:  {0}",  c.Name);
            }
        }
        catch{}            
    }
}
public  class  EmployeeList  :  IEnumerable
{
    private  ArrayList  carArray;

    public  EmployeeList()
    {
        carArray  =  new  ArrayList();
    }

    //  The  indexer.
    public  Employee  this[int  pos]
    {
        get
        {
            if(pos  <  0)
                throw  new  IndexOutOfRangeException("Hey!  Index  out  of  range");
            else
                return  (Employee)carArray[pos];
        }
        set
        {
            carArray.Insert(pos,  value);
        }
    }

    public  int  GetNumberOfEmployeeList()
    {
        return  carArray.Count;
    }

    public  IEnumerator  GetEnumerator()
    {
        return  carArray.GetEnumerator();
    }
}
public  class  Employee
{
    public  Employee(string  name)
    {
        this.Name  =  name;
    }
    public  string  Name;
}