C# Arrays Binary Search

using System;

class BinarySearch //source - wikipedia
{
    static void Main()
    {
        int[] arr = { 7, 12, 46, 2, 6, 24, 218, -5 };
        Console.Write("Choose a value from {0}:", string.Join(", ", arr));
        int value = int.Parse(Console.ReadLine());

        Array.Sort(arr);
        int minIndex = 0;
        int maxIndex = arr.Length - 1;

        while (maxIndex >= minIndex)
        {
            int midIndex = (maxIndex + minIndex) / 2;
            // determine which subarray to search
            if (arr[midIndex] < value)
            {
                // change min index to search upper subarray
                minIndex = midIndex + 1;
            }
            else if (arr[midIndex] > value)
            {
                // change max index to search lower subarray
                maxIndex = midIndex - 1;
            }
            else
            {
                value = midIndex;
            }
        }
        Console.WriteLine("Position {0} in this sorted array.", value);
    }
}