Generate 8 different random numbers between 1 and 49, C#

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            int[] numbers = new int[8]{0, 0, 0, 0, 0, 0, 0, 0};
            var counter = 0;
            
            do
            {
                Random random = new Random();
                var randomNumber = random.Next(1, 50);
                
                if (Array.IndexOf(numbers, randomNumber) == -1)
                {
                    numbers[counter] = randomNumber;
                    counter++;
                }
            } while(counter < 8);
            
            for (var i = 0; i < numbers.Length - 1; i++)
            {
                Console.Write(numbers[i] + ",");
            }
            
            Console.Write(numbers[numbers.Length - 1]);
        }
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,12 sec, absolute running time: 0,19 sec, cpu time: 0,17 sec, average memory usage: 22 Mb, average nr of threads: 4