generate random numbers with no repeat in c#

Question

How can I generate random numbers with no repeat in C#. I have one array and I want to fill every room with random numbers from 0 to 9. Each room shoud have diffrent numbers

Answer 1

This will create a unique range of 1 to rangeEx inclusive. The next two lines create a random number Generator and orders the IEnumerable range with a randome number. this is then called with ToArray and returned!

   private int[] RandomNumber(int rangeEx)
    {
        var orderedList = Enumerable.Range(1, range);
        var rng = new Random();
        return orderedList.OrderBy(c => rng.Next()).ToArray();
    }