Random But Different Array Initializer

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Practice
{
    class Program
    {
        static void Main(string[] args)
        {
            int size;
            size = int.Parse(Console.ReadLine());
            Random rnd = new Random();
            int[] arr = new int[size];
            for (int i = 0; i < arr.Length; i++)
            {
                arr[i] = rnd.Next(0,10);
                for (int b = 0; b < i; b++)
                {
                    while (arr[i] == arr[b])
                    {
                        arr[i] = rnd.Next(0, 10);
                        b = 0;
                    }
                }
            }

        }
    }
}