Arrays to txt file

Question

How to write three separate arrays into 1 txt file? By lines.

Answer 1

using (System.IO.StreamWriter file = new System.IO.StreamWriter("filename.txt", true))
{
foreach (string s : array) {
file.WriteLine(s);
}
}

and write 2 additional foreach loops for the other arrays

Answer 2

@Edward both acceptable.
First idea was "one line per array" but it seems that reading will be easier with "line per item"

Answer 3

do u want one line per array or one line per item in each array