test] CSharp.cs

using System;
class NameCard
{
 private string[] names;
 public NameCard(int i)
 {
  names = new string[i];
 }
 public string this[int index]
 {
  get
  {
   if(names[index] == null)
    return "Nothing in here.";
   else
    return names[index];
  }
  set
  {
   if(value == null)
    Console.WriteLine("Can't store Index value");
   else
    names[index] = value;
  }
 }
}

class MainApp
{
 public static void Main()
 {
  const int max = 5;
  NameCard my = new NameCard(max);
  my[0] = "kim";
  my[1] = "ha";
  my[2] = "yang";
  my[3] = "bae";
  my[4] = "shin";
  for(int i =0; i<max; i++)
   Console.WriteLine(my[i]);
 }
}