CountWords

using System;
using System.Collections.Generic;
using System.IO;
using System.Text.RegularExpressions;
using System.Linq;


class words
{
    public string Text { set; get; }
    public int Count { set; get; }
}


class RemoveWords
{
    static void Main()
    {
        try
        {
            StreamReader readerWord = new StreamReader("..//..//words.txt");
            StreamReader readerInput = new StreamReader("..//..//test.txt");
            StreamWriter writer = new StreamWriter("..//..//result.txt");
            List<words> wordList = new List<words>();
            using (readerWord)
            {
                string line = readerWord.ReadLine();
                while (line != null)
                {
                    words word = new words();
                    word.Count = 0;
                    word.Text = line;
                    wordList.Add(word);
                    line = readerWord.ReadLine();
                }
            }
            using (readerInput)
            {
                string line = readerInput.ReadLine();
                while (line != null)
                {
                    for (int i = 0; i < wordList.Count; i++)
                    {
                        int count = Regex.Matches(line, "\\b" + wordList[i].Text + "\\b").Count;
                        wordList[i].Count += count;
                    }
                    line = readerInput.ReadLine();
                }
            }
            List<words> ordered = wordList.OrderByDescending(a => a.Count).ToList();
            using (writer)
            {
                foreach (var word in ordered)
                {
                    writer.WriteLine(word.Text);
                }
            }
        }
        catch (DirectoryNotFoundException)
        {
            Console.WriteLine("Directory not found");
        }
        catch (FileNotFoundException)
        {
            Console.WriteLine("File not found");
        }
        catch (IOException)
        {
            Console.WriteLine("IO Exception");
        }

        catch (UnauthorizedAccessException)
        {
            Console.WriteLine("Unauthorized Access");
        }
    }
}