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.IO;
using System.Diagnostics;

namespace FindWord
{
    public partial class Form1 : Form
    {
        string selectedPath = null;
        string word = null;

        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            listBox1.Items.Clear();

            if (folderBrowserDialog1.ShowDialog() == DialogResult.OK)
            {
                word = textBox1.Text;
                if (word == "")
                    return;

                selectedPath = folderBrowserDialog1.SelectedPath;
                Recursion(selectedPath);
            }
        }

        void Recursion(string originalPath)
        {
            foreach (string filePath in Directory.GetFiles(originalPath))
                if (Contains(filePath, word))
                    listBox1.Items.Add(filePath);

            foreach(string directoryPath in Directory.GetDirectories(originalPath))
                Recursion(directoryPath);
        }

        bool Contains(string filePath, string word)
        {
            try
            {
                using (StreamReader sr = new StreamReader(filePath))
                    if (sr.ReadToEnd().Contains(word))
                        return true;

                return false;
            }

            catch { return false; }
        }

        private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            string selectedPath = (string)listBox1.SelectedItem;
            if (selectedPath == null)
                return;

            try
            {
                Process.Start(selectedPath);
            }

            catch { }
        }
    }
}