C# Program CheckZIPS

Question

Program checkZIPS is working well with all the zip code except "BK 87946". When I entered BK 87946 the output was “Zip BK 87946 not found”. That means program is behaving very strangely. Please explain. I am attaching the program.
using System;
public
class CheckZIPS
{
public static void Main()
{
string [] zips = {"BF 45633", "GJ 76895", "BK 87946", "NM 38657"};
int x;
string enterzip;
Console.Write("Enter Zip code: ");
enterzip = Console.ReadLine();
x = Array.BinarySearch(zips, enterzip);
if (x
Console.WriteLine("Zip {0} not found", enterzip);
else
Console.WriteLine("Zip {0} was found at position {1}",
enterzip, x);
}
}

Answer

Thank you very much for your answer

Answer

You must sort an array if you want to use binarysearch.
Array.Sort(zips);
Or you can use
x = Array .IndexOf(zips, enterzip);
Good Luck, Alex