using Wintellect.PowerCollections

/** A text file phones.txt holds information about people, their town and phone number:
Duplicates can occur in people names, towns and phone numbers. Write a program to read the phones file and execute a sequence of commands given in the file commands.txt:
find(name) – display all matching records by given name (first, middle, last or nickname)
find(name, town) – display all matching records by given name and town
*/

public class Person
{
    public string Name { get; set; }
    public string Town { get; set; }
    public string TelNumber { get; set; }

    public Person(string name, string town, string telNumber)
    {
        this.Name = name;
        this.Town = town;
        this.TelNumber = telNumber;
    }

    public override string ToString()
    {
        StringBuilder result = new StringBuilder();
        result.Append(this.Name).Append(" | ");
        result.Append(this.Town).Append(" | ");
        result.Append(this.TelNumber);

        return result.ToString();
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using Wintellect.PowerCollections;

class PeopleFinder
{
    public static string[] GetInput()
    {
        List<string> input = new List<string>();
        string line = Console.ReadLine();
        while (line != string.Empty)
        {
            input.Add(line);
            line = Console.ReadLine();
        }

        return input.ToArray();
    }

    static void Main(string[] args)
    {
        MultiDictionary<string, Person> PeopleNames = new MultiDictionary<string, Person>(true);
        MultiDictionary<string, Person> TownNames = new MultiDictionary<string, Person>(true);


        string[] input = GetInput();
        for (int i = 0; i < input.Length; i++)
        {
            string[] elements = input[i].Split('|');
            Person newPerson = new Person(elements[0].Trim(), elements[1].Trim(), elements[2].Trim());
            PeopleNames.Add(newPerson.Name, newPerson);
            TownNames.Add(newPerson.Town, newPerson);
        }

        string searchedName = GetSearchedName();
        HashSet<Person> peopleByName = GetPeopleByName(searchedName, PeopleNames);

        string searchedTown = GetSearchedTown();
        HashSet<Person> peopleByTown = GetPeopleByTown(searchedTown, TownNames);

        var result = peopleByName.Intersect(peopleByTown).ToList<Person>();
        foreach (var item in result)
        {
            Console.WriteLine(item);
        }
        //PrintResult(result);
    }

    private static void PrintResult(IEnumerable<Person> result)
    {
        foreach (var item in result)
        {
            Console.WriteLine(item);
        }
    }

    private static HashSet<Person> GetPeopleByTown(string searchedTown, MultiDictionary<string, Person> PeopleNames)
    {
        var searchedPeople = PeopleNames[searchedTown];
        HashSet<Person> foundPeople = new HashSet<Person>();
        foreach (var item in searchedPeople)
        {
            foundPeople.Add(item);
        }

        return foundPeople;
    }

    private static string GetSearchedTown()
    {
        return "Varna";
    }

    private static HashSet<Person> GetPeopleByName(string searchedName, MultiDictionary<string, Person> PeopleNames)
    {
        var searchedPeople = PeopleNames[searchedName];
        HashSet<Person> foundPeople = new HashSet<Person>();
        foreach (var item in searchedPeople)
        {
            foundPeople.Add(item);
        }

        return foundPeople;
    }

    private static string GetSearchedName()
    {
        return "Kireto";
    }
}