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;

namespace DictionaryDemo
{
    public partial class Form1 : Form
    {
        Dictionary<string, string> myDictionary = new Dictionary<string, string>();

        public Form1()
        {
            InitializeComponent();
            myDictionary.Add("bat", "a flying mammal");
            myDictionary.Add("cat", "a furry animal");
            myDictionary.Add("ball", "a round object");

        }

        private void button1_Click(object sender, EventArgs e)
        {
            string word = textBox1.Text;
            string def = textBox2.Text;
            bool found = myDictionary.ContainsKey(word);
            if (!found)
                myDictionary.Add(word, def);
            else
                richTextBox1.Text = "word already exists in the dictionary.";
            textBox2.Text = "";
        }

        private void button2_Click(object sender, EventArgs e)
        {
            string word = textBox1.Text;
            string def;
            if (myDictionary.TryGetValue(word, out def))
                richTextBox1.Text = word + ": " + def;
            else
                richTextBox1.Text = "word not found.";
        }

        private void button3_Click(object sender, EventArgs e)
        {
            string text = "DICTIONARY CONTENTS\n";
            foreach(string word in myDictionary.Keys)
            {
                string def;
                myDictionary.TryGetValue(word, out def);
                text += word + ": " + def +"\n";
            }
            richTextBox1.Text = text;
        }
    }
}