/* list the files under the folder.*/

    string filePath = @"C:\folder\data.txt";
            if (File.Exists(filePath) == true)
            {
                DirectoryInfo direcPath = new DirectoryInfo(@"C:\folder\");
                FileInfo[] rgFiles = direcPath.GetFiles();

                foreach (FileInfo fi in rgFiles)
                {
                    if(!(fi.Name == "data.txt"))
                    {
                        labelName.Add(fi.Name.Substring(0,(fi.Name.Length - 4)));
                    }

                }
            }
            else
            {
                Directory.CreateDirectory(@"C:\folder");
                FileStream fs = File.Create(@"C:\folder\data.txt");
                fs.Close();
            }