.NET Replace text in files class

Code
public class FileReplace

    {

        public delegate void FileProcessed(string fileName, string replace, Dictionary<int, string> linesReplaced);

        public event FileProcessed FileProcessedHandler;



        public void Replace(string search, string replace, string path, bool subDirectories = false, bool caseSensitive = false)

        {

            if (Directory.Exists(path) || File.Exists(path))

            {

                if (Path.HasExtension(path))

                {

                    ReplaceFile(path, search, replace, caseSensitive);

                }

                else

                {

                    var files = Directory.GetFiles(path, "*.*", subDirectories ? SearchOption.AllDirectories : SearchOption.TopDirectoryOnly);

                    foreach(var file in files)

                    {

                        ReplaceFile(file, search, replace, caseSensitive);

                    }

                }

            }

        }





        private void ReplaceFile(string path, string search, string replace, bool caseSensitive)

        {

            if (File.Exists(path))

            {

                var file = File.ReadAllLines(path);

                search = caseSensitive ? path.ToLower() : search;

                var linesReplaced = new Dictionary<int, string>();

                for (int l = 0; l < file.Length; l++)

                {

                    var line = caseSensitive ? file[l].ToLower() : file[l];

                    if (line.Contains(search))

                    {

                        file[l] = file[l].Replace(search, replace);

                        linesReplaced.Add(l, file[l]);

                    }

                }

                File.WriteAllLines(path, file);

                FileProcessedHandler(path, replace, linesReplaced);

            }

        }



    }