How Can I Avoid Duplicate Random Numbers in C#?

Avoid Duplicate Random Values by Seeding Random Class

The issue described is that the random values generated by the Random class are not truly random, leading to duplicate numbers being generated within a loop. This occurs because the random number generator (RNG) uses a seed value to generate numbers, and if the same seed is used each time, the same sequence of numbers will be generated.

To overcome this issue, it is essential to seed the RNG with a different value each time. This ensures that the sequence of random numbers is truly random and not predictable.

One effective method of seeding the RNG is to use the hash code of a randomly generated GUID (globally unique identifier). This approach generates a highly random seed value due to the inherent randomness of GUIDs.

Below is an example code that demonstrates this technique:

Random rand = new Random(Guid.NewGuid().GetHashCode());

By implementing this seeding method, you can avoid duplicate random values and obtain a truly unpredictable sequence of numbers for your application.

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