Userful Custom Indexer in C#

This code snippet is for custom indexer in c# like dictionary, where you access value by directly specifying Name or add an key value pair to collection by directly specifying the [name] = value.

using System;
using System.Collections.Generic;


namespace CSharpMagic.IndexerDemo
{
      class CustomIndexers
      {
            public static void Main(string[] args)
            {
                  NameCollection collection = new NameCollection();
                  collection["Name"] = "Xyz";
                  Console.WriteLine(collection["Name"]);
                  Console.ReadKey();
            }
       }
      class NameCollection
      {
            private List<Pair> _pairs = new List<Pair>();
            public string this[string key]
            {
                  get
                  {
                        return _pairs != null && _pairs.Count > 0
                                             ?_pairs.Find(p => p.Key == key).Value
                                             : string.Empty;
                   }
                  set
                  {
                       _pairs.Add(new Pair { Key = key, Value= value});
                   }
             }
      }
      class Pair
      {
            public string Key { get; set; }
            public string Value { get; set; }
       }
}