Saving from List to txt

Question

I want my program to read from two text files into one List. The List is sorting and cleaning duplicates.

I want the

Answer 1

It's this line which writes the ToString representation of the List, resulting into the text line you got:

StreamWriter file = new System.IO.StreamWriter(speichern);
file.WriteLine(ausgabeListe);
file.Close();

Instead you want to write each line.

StreamWriter file = new System.IO.StreamWriter(speichern);
ausgabeListe.ForEach(file.WriteLine);
file.Close();