c# - Most efficient way to retrieve one file path from a list of folders -

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Assume that I have a list of more than 100 folder paths. I want to recover only one file path from each folder path. Here's the way I'm doing this or plan to do this: 

  var files = new list & lt; String & gt; (); Var Directories = Directory Gate Directories ("C: \\ FirstFolder \\ Second Folder \\"); Array.ForEach (Directories, D => Files. Update (Directory.GetFiles (D). FirstOrDefault ()));

Now, is this the most effective way? Because my program starts this code every time.

If you are using .NET 4.0 then you should do it instead ... < / P> 

  var files = directory. Select (x = & gt; directory. Indexed files (x). FirstOver Default ()). ToList ();

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