// http://svc.luckstar.com.tw/CodeHelper/cs/index.html
// 2017-03-26, honda@luckstar.com.tw, Create.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
// add
using System.Collections.Specialized;
using System.Collections;


namespace ConsoleBase
{
    public class CNameValueCollection
    {
        NameValueCollection mList1 = new NameValueCollection();
        public void Run()
        {
            mList1.Add("red", "rojo");
            mList1.Add("green", "verde");
            mList1.Add("blue", "azul");
            mList1.Add("red", "rouge");

            // Displays the values in the NameValueCollection in two different ways.
            Console.WriteLine("Displays the elements using the AllKeys property and the Item (indexer) property:");
            PrintByEnumerator(mList1);
            Console.WriteLine("Displays the elements using GetKey and Get:");
            PrintByCount(mList1);

            // Gets a value either by index or by key.
            Console.WriteLine("Index 1 contains the value {0}.", mList1[1]);
            Console.WriteLine("Key \"red\" has the value {0}.", mList1["red"]);
            Console.WriteLine();

            // Copies the values to a string array and displays the string array.
            String[] sa1 = new String[mList1.Count];
            mList1.CopyTo(sa1, 0);
            Console.WriteLine("The string array contains:");
            foreach (String s in sa1)
                Console.WriteLine("   {0}", s);
            Console.WriteLine();

            // Searches for a key and deletes it.
            mList1.Remove("green");
            Console.WriteLine("The collection contains the following elements after removing \"green\":");
            PrintByEnumerator(mList1);

            // Clears the entire collection.
            mList1.Clear();
            Console.WriteLine("The collection contains the following elements after it is cleared:");
            PrintByEnumerator(mList1);
        }
        private void PrintDashLine()
        {
            Console.WriteLine();
            Console.WriteLine("----------");
        }
        public static void PrintByEnumerator(NameValueCollection myCol)
        {
            Console.WriteLine("PrintByEnumerator()");
            IEnumerator myEnumerator = myCol.GetEnumerator();
            Console.WriteLine("   KEY        VALUE");
            foreach (String s in myCol.AllKeys)
                Console.WriteLine("   {0,-10} {1}", s, myCol[s]);
            Console.WriteLine();
        }

        public static void PrintByCount(NameValueCollection myCol)
        {
            Console.WriteLine("PrintByCount()");
            Console.WriteLine("   [INDEX] KEY        VALUE");
            for (int i = 0; i < myCol.Count; i++)
                Console.WriteLine("   [{0}]     {1,-10} {2}", i, myCol.GetKey(i), myCol.Get(i));
            Console.WriteLine();
        }
    }
}

result:

Displays the elements using the AllKeys property and the Item (indexer) property:
PrintByEnumerator()
   KEY        VALUE
   red        rojo,rouge
   green      verde
   blue       azul

Displays the elements using GetKey and Get:
PrintByCount()
   [INDEX] KEY        VALUE
   [0]     red        rojo,rouge
   [1]     green      verde
   [2]     blue       azul

Index 1 contains the value verde.
Key "red" has the value rojo,rouge.

The string array contains:
   rojo,rouge
   verde
   azul

The collection contains the following elements after removing "green":
PrintByEnumerator()
   KEY        VALUE
   red        rojo,rouge
   blue       azul

The collection contains the following elements after it is cleared:
PrintByEnumerator()
   KEY        VALUE