In The craft
Code: Weighted Random Distribution
This blog post presents a method for generating random numbers, with the pitfall of the predictable nature of time-based random number generators.
This is genius; I could have used this a couple of years ago. I’m posting it here for safe keeping. Note that I am NOT using the random class. The random class is not truly random. It’s based on time. Time is predictable.
RNGCryptoServiceProvider rng = new RNGCryptoServiceProvider();
byte[] result = new byte[8];
rng.GetBytes(result);
double rand = (double)BitConverter.ToUInt64(result, 0) / ulong.MaxValue;
//40 percent chance of being selected.
if (rand > 0.40d )
{
...
}