C# Binary Search

This method searches a one-dimensional Array for a value. The value must be in sorted order.
See the example below, it accepts two arguments: an array(students) and the value(“John Smith”) to be searched for
-------------------------------------------------------------------------
List<string> students = College.Students;
var result =Array.BinarySearch(students,“John Smith”);
-------------------------------------------------------------------------
http://msdn.microsoft.com/en-us/library/system.array.binarysearch.aspx
-------------------------------------------------------------------------
using System;
using System.Collections.Generic;


public static void BinarySearchName(ArrayList nameList)
{
            CollectionBuilder cb = new CollectionBuilder();
            ArrayList nameList = cb.GetNameCollection();
            LinkedList<Person> persons = cb.GetPersonCollectionAsList();

            string nameToFind;
            Console.Write("\nEnter the name to find : ");
            nameToFind = Console.ReadLine();
            Console.WriteLine("\nStarting binary search\n");

            int i = nameList.BinarySearch(nameToFind);
            if (i < 0)
            {
                Console.WriteLine("Sorry the name " + nameToFind + " could not be found,\n");
             }
            else
            {
                Console.WriteLine("The name " + nameToFind + " was found");
            }
 }
-------------------------------------------------------------------------