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I have a bunch of txt files in a directory, which I want to merge into a file. At the end of each file I want to add a cart / return line.

What is the best way to do this in C #?

One-liner that is significantly worse on memory consumption: 

  File. Merge all lines (targetFileName, Directory.GetFiles (srcFolder, "* .txt") .SelectMany (f => File.ReadLines (f) .Concat (new [] {Environment.NewLine})));   
 Hope you can stay in the end with additional Newline.

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