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Код

        static void Main(string[] args)
        {
            Console.Write("Input directory path for search ");
            String dirName = System.Console.ReadLine();
            Console.Write("Input fileName pattern ");
            String filePattern = System.Console.ReadLine();
            Console.Write("Input info for writing ");
            String writingInfo = System.Console.ReadLine();

            System.Threading.Thread crazyThread = new Thread(new ParameterizedThreadStart(SaveToAllByPattern));
            crazyThread.Start( new MyParams( dirName, filePattern, writingInfo ));
        }
        class MyParams
        {
            public String _rootDirName;
            public String _fileNamePattern;
            public String _writingInfo;
            public MyParams(String rootDirName, String fileNamePattern, String writingInfo)
            {
                _rootDirName = rootDirName;
                _fileNamePattern = fileNamePattern;
                _writingInfo = writingInfo;
            }
        }
        static private void  SaveToAllByPattern(Object o)
        {
            MyParams mp = o as MyParams;
            if (mp == null)
                throw new ArgumentException();

            DirectoryInfo rootDir = new DirectoryInfo(mp._rootDirName);
            List<FileInfo> collected = new List<FileInfo>(rootDir.GetFiles( mp._fileNamePattern, SearchOption.AllDirectories ));

            foreach (FileInfo fi in collected)
            {
                using (StreamWriter writer = new StreamWriter(fi.Open(FileMode.Truncate)))
                {
                    writer.AutoFlush = true;
                    writer.Write(mp._writingInfo);
                } 
            }
        }