Read password from stdin

gistfile1.cs

public static string ReadPassword () {
  const char PLACEHOLDER = '*';
  var accum = new StringBuilder ();
  while (true) {
    var key = Console.ReadKey (true);
    if (key.Key == ConsoleKey.Backspace) {
      if (accum.Length > 0) {
        accum.Remove (accum.Length - 1, 1);
        Console.Write ("\b \b");
      }
    } else if (key.Key == ConsoleKey.Enter) {
      Console.Write ('\n');
      return accum.ToString ();
    } else {
      Console.Write (PLACEHOLDER);
      accum.Append (key.KeyChar);
    }
  }
}