Allow The User To Vote For Any Contestant Any Time By Entering The Last Name Of The Contestant"?

I am having much difficulty with it... heres what i have to do

"Write a program that allows users to vote on their favorite singer American Idol style. Your program should have the following features:

Your program should use a single listbox to display the names of the contestants and the number of votes for each contestant.

Use a class to hold the contestant�s first name, last name, and number of votes. The class should include a method to increment the contestant�s vote count by 1. Be sure to use property procedures for the first name, last name and number of votes properties.

Your program should read the names of contestants from an input file and display them in the listbox. You cannot make assumptions about how many contestants there will be in advance.

Your program should allow the user to sort the contestants by the number of votes they got. It should also allow the user to vote for any contestant any time by entering the last name of the contestant."So far this is the only code that I have... not sure why nothing is working.

Public Class Form1
Dim count As Integer = 0
Dim namearray(0) As Contestant[code]....