C# Implementation of the Fischer-Yates shuffle

fischer-yates.cs

using System;

namespace Fisher_Yates_shuffle
{
    class Program
    {
        static void Main(string[] args)
        {
            // Generate a set of numbers from user input...
            Console.Write("Enter count of numbers to shuffle: ");
            var count = Convert.ToInt32(Console.ReadLine());
            var numbers = new int[count];
            for (int i = 0; i < count; i++)
            {
                Console.Write($"Input the {i + 1}st number: ");
                var num = Convert.ToInt32(Console.ReadLine());
                numbers[i] = num;
            }
            
            Console.WriteLine("Original array: [" + string.Join("; ", numbers) + "]");
            
            // Randomly swap numbers...
            ShuffleIntArr(numbers);
            
            Console.WriteLine("Swapped array: [" + string.Join("; ", numbers) + "]");
        }

        private static void ShuffleIntArr(int[] arr)
        {
            //Fisher Yates shuffle
            Random rnd = new Random();
            for (int i = arr.Length - 1; i >= 0; i--)
            {
                var randIndex = rnd.Next(0, i);
                SwapAt(arr, i, randIndex);
            }
        }

        private static void SwapAt(int[] arr, int a, int b)
        {
            var temp = arr[a];
            arr[a] = arr[b];
            arr[b] = temp;
        }
    }
}