using System;
using System.Linq;
using System.Text;
using System.Collections.Specialized;

namespace TestMultipleKeyDictionary8282
{
    public class Program
    {
        static void Main(string[] args)
        {
            NameValueCollection variables = new NameValueCollection();

            variables.Add("title", "Report #3");
            variables.Add("description", "This is the description.");
            variables.Add("note", "more information is available from marketing");
            variables.Add("note", "time limit for this project is 18 hours");
            variables.Add("todo", "expand the outline");
            variables.Add("todo", "work on the introduction");
            variables.Add("todo", "lookup footnotes");

            string[] singleVariableNames = { "title", "subtitle", "description", "author", "datePublished" };
            string[] multipleVariableNames = { "note", "todo", "info" };

            foreach (var singleVariableName in singleVariableNames)
            {
                if (variables.Get(singleVariableName) != null)
                    Console.WriteLine("{0,-15} {1}", singleVariableName, variables.Get(singleVariableName));
                else
                    Console.WriteLine("{0,-15} {1}", singleVariableName, "N/A");
            }

            foreach (var multipleVariableName in multipleVariableNames)
            {
                if (variables.Get(multipleVariableName) != null)
                    variables.GetValues(multipleVariableName).ToList().ForEach(v => Console.WriteLine("{0,-15} {1}", multipleVariableName, v));
                else
                    Console.WriteLine("{0,-15} {1}", multipleVariableName, "N/A");
            }

            ShowEntries(variables);
            variables.Remove("todo");
            ShowEntries(variables);
            variables.Clear();
            ShowEntries(variables);

            Console.ReadLine();
        }

        public static void ShowEntries(NameValueCollection nvc)
        {
            StringBuilder sb = new StringBuilder();
            for (int i = 0; i < nvc.Keys.Count; i++)
            {
                sb.Append(nvc.Keys[i] + ", ");        
            }
            Console.WriteLine("There are {0} kinds of keys: {1}", nvc.Count, sb.ToString().TrimEnd(new char[] {',',' '}));
        }
    }
}