how to access each folder in a given folder

var files = Directory.GetFiles(
    dir, "*.exe").
        Where(item => item.ToLower().EndsWith(".exe"));

string path="D:\..... or what so ever u want ";
     if (Directory.Exists(path))
     {
         string[] dirs = Directory.GetDirectories(path);
         foreach (string dir in dirs)
         {
             string[] files = Directory.GetFiles(dir);
             foreach (string file in files)
             {
              if(File.Exists(file)
              {
              //Do the coding here
              }
          }
    }