How do I seed a random class to avoid getting dupl

Question

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• Random number generator only generating one random number 9 answers

I have the following code inside a static method in a static class:

Random r = new Random();
int randomNumber = r.Next(1,100);

I have this inside a loop and I keep getting the same randomNumber!

Any suggestions here?

Answer 1

public static Random rand = new Random(); // this happens once, and will be great at preventing duplicates

Note, this is not to be used for cryptographic purposes.

Answer 2

A good seed initialisation can be done like this

Random rnd = new Random((int)DateTime.Now.Ticks);

The ticks will be unique and the cast into a int with probably a loose of value will be OK.