using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Collections;


namespace UseHashtable
{

    public partial class Form1 : Form
    {
        Hashtable hashtable = new Hashtable();
        ICollection keys, values;

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {   // Populate hashtable
            hashtable.Add("1111 1111".Replace(" ", ""), "Ms. Dorothy Lesley Malone");
            hashtable.Add("1111 1112".Replace(" ", ""), "Mr. George Alfred Snodgrass");
            hashtable.Add("1111 1113".Replace(" ", ""), "Mr. Sammy Davis Junior");
            hashtable.Add("1111 1114".Replace(" ", ""), "Mrs. Harriett Miriam Lowly");
            hashtable.Add("1111 1115".Replace(" ", ""), "Ms. Julie Susan Rigg");
            hashtable.Add("1111 1116".Replace(" ", ""), "Mr. Elliott J. Ness");

            // get keys
            keys = hashtable.Keys;

            // get values
            values = hashtable.Values;
        }

        private void nameButton_Click(object sender, EventArgs e)
        {
            foreach (DictionaryEntry entry in hashtable)
            {
                if (entry.Value.ToString().ToUpper().Replace(" ", "") == nameTextBox.Text.ToString().ToUpper().Replace(" ", ""))
                {
                    numberTextBox.Text = entry.Key.ToString();
                }
            }
        }

        private void numberButton_Click(object sender, EventArgs e)
        {
            try
            {
                nameTextBox.Text = hashtable[numberTextBox.Text.ToString()].ToString();
            }
            catch (Exception ex)
            {
            }
        }
    }
}