Read folder file and execute program

 public void remove_recursive(DirectoryInfo dir)
        {
           FileInfo[] fi = dir.GetFiles();
            foreach (FileInfo f in fi)
            {
              if (f.CreationTime <= DateTime.Today.AddDays(-30))
                {
                  f.Delete();
                }
            }
        }

//-------------------------------------------------------------------------
string chk = Application.StartupPath + "\\hhhh";
          remove_recursive(new DirectoryInfo(directoryPath));