Question

I need a method to return a random string in the format:

Letter Number Letter Number Letter Number

Answer 1

Assuming you don’t need it to be threadsafe:

private static readonly Random rng = new Random();  private static RandomChar(string domain) {     int selection = rng.Next(domain.Length);     return domain[selection]; }  private static char RandomDigit() {     return RandomChar('0123456789'); }  private static char RandomLetter() {     return RandomChar('ABCDEFGHIJKLMNOPQRSTUVWXYZ'); }  public static char RandomStringInSpecialFormat() {     char[] text = new char[6];     char[0] = RandomLetter();     char[1] = RandomDigit();     char[2] = RandomLetter();     char[3] = RandomDigit();     char[4] = RandomLetter();     char[5] = RandomDigit();     return new string(text); } 

(You could use a 3-iteration loop in RandomStringInSpecialFormat, but it doesn’t have much benefit.)

If you need it to be thread-safe, you’ll need some way of making sure you don’t access the Random from multiple threads at the same time. The simplest way to do this (in my view) is to use StaticRandom from MiscUtil.