Why does Random.Next() always return the same number [duplicate]

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You’re always seeding a new instance with the same seed, and then grabbing the first max. By using a Seed, you’re guaranteeing the same results.

If you want to have a static, random number generation that does different results, you should rework this a bit. However, since Random is not threadsafe, it requires some synchronization when used statically. Something like:

private static Random random;
private static object syncObj = new object();
private static void InitRandomNumber(int seed)
{
     random = new Random(seed);
}
private static int GenerateRandomNumber(int max)
{
     lock(syncObj)
     {
         if (random == null)
             random = new Random(); // Or exception...
         return random.Next(max);
     }
}

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