How to fill an array with unique values?

Question

C++ / C#

There is an array and it must be filled with numbers in the range, for example, from 1 to 10, in random order.
For example, element a[1] contains 7, element a[2] contains 4.

Answer 1

You open the documentation for System.Random and read the examples, it's just about numbers.

Answer 2

We create a list of numbers from 1 to 10, then we cut out elements from it at random indices and write them to our array.

Answer 3

one.

Random rn = new Random();
var array = Enumerable.Range(0, 10).Select(x => rn.Next(255)).ToArray();

2.

var array = Enumerable.Range(0, 10).OrderBy(x => Guid.NewGuid()).ToArray();