filling a array with random numbers between 0-9 in c# [duplicate]

Answer 1

How about

int[] page = new int[100];
Random rnd = new Random();
for (int i = 0; i < page.Length; ++i)
  page[i] = rnd.Next(10);

Answer 2

You have an array of 100 numbers and draw from a pool of 10 different ones. How would you expect there to be no duplicates?

Don't overcomplicate the thing, just write what needs to be written. I.e.:

1. Create the array
2. Loop over the size of it
3. Put a random number between from [0, 9] in the array.

Answer 3

Random r = new Random(); //add some seed
int[] randNums = new int[100]; //100 is just an example
for (int i = 0; i < randNums.Length; i++)
    randNums[i] = r.Next(10);