Random number generation that can be used for SMS codes and similar.

Generate Random number

private int GenerateRandomNumber()
{
    int number = 0;
    byte[] randomNumber = new byte[1];
    do
    {
        var rngCsp = new RNGCryptoServiceProvider();
        rngCsp.GetBytes(randomNumber);
        var digit = randomNumber[0] % 10;
        number = number * 10 + digit;
    } 
    while (number.ToString().Length < 6);
    
    return number;
}