/// <summary>
/// Generates a random string of the specified length, taking characters from the specified arsenal of characters.</summary>
/// <param name="length">
/// Length of the string to generate.</param>
/// <param name="takeCharactersFrom">
/// Arsenal to take random characters from. (Default is upper- and lower-case letters and digits.)</param>
/// <param name="rnd">
/// If not <c>null</c>, uses the specified random number generator.</param>
public static string GenerateString(int length, string takeCharactersFrom = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789", Random rnd = null)
{
if (takeCharactersFrom == null)
{
throw new ArgumentNullException(nameof(takeCharactersFrom));
}
return(new string(Ut.NewArray(length, i => takeCharactersFrom[rnd == null ? Rnd.Next(takeCharactersFrom.Length) : rnd.Next(takeCharactersFrom.Length)])));
}
