Playing with arrays using c#

arrays1

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class _Default : System.Web.UI.Page
{
    string[,] product = new string[5, 2]; //two dimensional array with 5 rows, 2 collumns


    protected void Page_Load(object sender, EventArgs e) //create list of items 


    {

        product[0, 0] = "Lettuce";
        product[0, 1] = ".99;";
        product[1, 0] = "carrots";
        product[1, 1] = "2.98";
        product[2, 0] = "Apple";
        product[2, 1] = ".68";
        product[3, 0] = "Tomato";
        product[3, 1] = ".80";
        product[4, 0] = "Celery";
        product[4, 1] = "1.10";

        if (!IsPostBack)
        {
            GetProduce();
        }
    }



    //method
    protected void GetProduce()
    {
        for (int i = 0; i < 5; i++) //++ incrementing by 1
        {
            ListItem item = new ListItem();
            item.Text = product[i, 0];  //add text to array
            ProduceCheckbox.Items.Add(item);  //add items
        }
    }



    protected void Button1_Click(object sender, EventArgs e)
    {
        int counter = 0;
        double total = 0;
        foreach (ListItem item in ProduceCheckbox.Items)
        {
            //string productName = product[counter, 0];
            if (item.Selected)
            {
                if (item.Text.Equals(product[counter, 0]))
                {
                    total += double.Parse(product[counter, 5]);
                }
            }
            counter++;
        }
        Label2.Text = "Your Total is " + total.ToString("C");
    }
}