Send the content of an Array in a text file in C#

Question

I'm creating a little program in c# that allows you to send the content of an array of numbers to a text file. But when I open the text file, it only show the last element of the array (10). How can I make sure that he sends all the numbers in the text file and not only the last number.

int[] Numbers = { 1, 2, 4, 5, 6, 7, 8, 9, 10 };
        string path = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);
        foreach (var x in Numbers)
        {
            File.WriteAllText(path + @"\" + "numbers.txt", x .ToString () + "\r\n";
        }

Answer 1

You could use string.Join and get rid of the foreach :

 File.WriteAllText(path + @"\numbers.txt", string.Join(Environment.NewLine, Numbers));

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Or you could use the foreach loop but change to AppendAllText instead of WriteAllText :

foreach (var x in Numbers)
{
    File.AppendAllText(path + @"\numbers.txt", x.ToString() + "\r\n");
}

WriteAllText will replace all the text in a file while AppendAllText will append to the file. In your example WriteAllText is overwriting the previous value(s) so you only end up with the last value in the file.