using System;

using System.Collections;

public class Program

{

    public static void Main()

    {

        string[] myAddresses = {"1234 ABCD Blvd", "5555 Example Street", "231 8th Avn N", "1421 5th St.N", "231 8th Avn N", "1234 ABCD Blvd"};

        var myAddressList = new ArrayList();

​

        for (int i = 0; i < myAddresses.Length; i++) 

        {

            if (myAddressList.Contains(myAddresses[i]) == false) 

            {

                myAddressList.Add(myAddresses[i]);

            }

        }

​

        var myAddressNoDuplicates = myAddressList.ToArray();

​

        for (int i = 0; i < myAddressNoDuplicates.Length; i++) {

            Console.WriteLine(myAddressNoDuplicates[i]);

        }

    }

}