Cryptographic Random Number Generation example.

CrngExample.cs

public class Example
{
    private static int GetRandomNumber(int max)
    {
        var bytes = new byte[3];
        var cr = new System.Security.Cryptography.RNGCryptoServiceProvider();

        cr.GetBytes(bytes);

        // Get 3 random digits as a string, and parse it as an int, then keep it between 0 and the max
        var key = int.Parse((bytes[0] % 10) + (bytes[1] % 10).ToString() + (bytes[2] % 10)) * max / 1000;

        return key;
    }

    private static int GetRandomNumber(int min, int max)
    {
        var value = GetRandomNumber(max - min);

        return min + value;
    }
}