List string to file C#

string[] lines = { "First line", "Second line", "Third line" };
System.IO.File.WriteAllLines(@"C:\Users\Public\TestFolder\WriteLines.txt", lines);
lines = { "Fourth line", "Fith line" };
System.IO.File.AppendAllLines(@"C:\Users\Public\TestFolder\WriteLines.txt", lines);

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