C# String Searcher

Below is a little C# program that I wrote which searches all files within a directory for a custom string. Could come in handy nah?

If you have any comments regarding the code, feel free to comment.

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

namespace MyProgram
{
    class Program
    {
        static int results = 0;
        static int dirs_searched = 1;
        static int files_searched = 0;

        static void SearchForString(string _dir, string searchstring)
        {
            try
            {
                DirectoryInfo dir = new DirectoryInfo(_dir);

                string[] _files = Directory.GetFiles(_dir);
                int counter=0;

                foreach (string file in _files)
                {
                    files_searched++;

                    if ((counter = ReadIt(file, searchstring)) > 0)
                    {
                        results += counter;
                        Console.WriteLine("Found \"{0}\" in {1} - {2} times.", searchstring, file, counter);
                    }
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine("Error: " + ex.Message);
            }

            try
            {
                string[] _dirlist = Directory.GetDirectories(_dir);
                foreach (string subdir in _dirlist)
                {
                    dirs_searched++;
                    SearchForString(subdir, searchstring);
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine("Error: " + ex.Message);
            }
        }

        static int ReadIt(string file, string searchstring)
        {
            string line = "";
            int counter = 0;

                try
                {
                    StreamReader sr = File.OpenText(file);
                    while (!sr.EndOfStream)
                    {
                        line = sr.ReadLine();
                        if (line.Contains(searchstring))
                            counter++;
                    }

                    return counter;
                }
                catch (Exception ex)
                {
                    Console.WriteLine("Error: " + ex.Message);
                }
                return 0;

        }

        static void Main(string[] args)
        {

            string searchstring="";
            string dirstart = "";

            Console.WriteLine("String searcher.\n");

            Console.Write("Enter string to search for: ");
            searchstring = Console.ReadLine();
            Console.Write("Enter directory to search: ");
            dirstart = Console.ReadLine();

            try
            {
                if (Directory.Exists(dirstart))
                {
                    Console.WriteLine("\nSearching {0} for \'{1}\'", dirstart, searchstring);
                    SearchForString(dirstart, searchstring);

                    Console.WriteLine("\n================\nFound {0} results.", results);
                    Console.WriteLine("\n{0} directorie(s)", dirs_searched);
                    Console.WriteLine("\n{0} files.", files_searched);
                    Console.WriteLine("\n================");

                }
                else
                {
                    Console.WriteLine("Path could not be found.");
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine("Error: " + ex.Message);
            }
        }
    }
}

Compiled version can be found here: Download String Searcher

- Imraan Moosa