How can I get this namespace thing to work in GUI C#

<pre>using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;
using System.Windows.Forms;
using System.Text.RegularExpressions;

namespace GELookup
{
    public class GELookup
    {
        private ArrayList id;
        private ArrayList name;
        public List<string> Result;

        public GELookup(string Item, bool MultiPage, int Page)
        {
            try
            {
                Result = new List<string>();
                id = new ArrayList();
                name = new ArrayList();

                //Get GE HTML.
                string strPage = GetFile("http://itemdb-rs.runescape.com/results.ws?query=" + Item + "&sup=All&cat=All&sub=All&page=" + Page + "&vis=1&order=1&sortby=name&price=all&members=");
                string[] splitter = new string[] { "./viewitem.ws?obj=" };
                string[] array;

                //Split the HTML at the Items.
                array = strPage.Split(splitter, StringSplitOptions.None);
                splitter = new string[] { "\"> " };

                //Add the Items while cleaning up the names/ID's
                for (int i = 1; i < array.Length; i++)
                {
                    id.Add(array[i].Split(splitter, StringSplitOptions.None)[0]);
                    name.Add(array[i].Split(splitter, StringSplitOptions.None)[1].Split(new string[] { "</a>" }, StringSplitOptions.None)[0]);
                }

                //Add the Items to the Result List
                for (int i = 0; i < id.Count; i++)
                {
                    Result.Add(name[i].ToString()); ;
                }

                //If MultiPage is true find the last page number and repeat
                //the search with ParsePage() method.
                if (MultiPage)
                {
                    int Start = strPage.IndexOf("<td class=\"navmid\">\n1");
                    int Finish = strPage.IndexOf("</td>\n<td class=\"navright\">");
                    string Data = "blank";
                    if (Start > 0 && Finish > 0)
                    {
                        Data = strPage.Substring(Start);
                        Data = Data.Substring(0, Data.IndexOf("</td>\n"));
                        Data = Data.Substring(Data.LastIndexOf("bers=\">") + 7, 1);
                        string[] Data2 = Data.Split(new string[] { "\n<a href=\"./results.ws?query=" + Item + "&sup=All&cat=All&sub=All&page=2&vis=1&order=1&sortby=name&price=all&members=\">", "</a>", "<td>" }, StringSplitOptions.None);

                        List<object> _Results = new List<object>();

                        char[] number = Data.ToCharArray();
                        if (Char.IsNumber(number[0]))
                        {
                            int Count = Convert.ToInt32(Data);
                            for (int X = 2; X <= Count; X++)
                            {
                                _Results.Add(ParsePage(Item, X));
                            }

                            //All of the pages have been parsed so add it all to the Result List.
                            for (int i = 0; i < _Results.Count; i++)
                            {
                                Result.AddRange((List<string>)_Results[i]);
                            }
                        }
                    }
                }
            }
            catch
            {
                MessageBox.Show("Error Code: 010.\r\nPlease post this Error Code in the Bug's\r\nSection of the forum.\r\nThank you.");
            }
        }

        public GELookup()
        { }

        //Self Explanitory.
        private string GetFile(string strURL)
        {
            try
            {
                WebRequest myWebRequest = WebRequest.Create(strURL);

                WebResponse myWebResponse = myWebRequest.GetResponse();

                Stream ReceiveStream = myWebResponse.GetResponseStream();

                Encoding encode = System.Text.Encoding.GetEncoding("utf-8");

                StreamReader readStream = new StreamReader(ReceiveStream, encode);

                string strResponse = readStream.ReadToEnd();

                readStream.Close();

                myWebResponse.Close();
                return strResponse;
            }
           catch(Execption e)
            {
                MessageBox.Show(e.ToString());
                return null;
            }
        }
        
        //Basicly a copy of the Constructor only this only parses one page...
        private List<string> ParsePage(string Item, int Page)
        {
            try
            {
                ArrayList id1 = new ArrayList();
                ArrayList name1 = new ArrayList();
                List<string> Result1 = new List<string>();

                string strPage = GetFile("http://itemdb-rs.runescape.com/results.ws?query=" + Item + "&sup=All&cat=All&sub=All&page=" + Page + "&vis=1&order=1&sortby=name&price=all&members=");
                string[] splitter = new string[] { "./viewitem.ws?obj=" };
                string[] array;
                array = strPage.Split(splitter, StringSplitOptions.None);
                splitter = new string[] { "\"> " };
                for (int i = 1; i < array.Length; i++)
                {
                    id.Add(array[i].Split(splitter, StringSplitOptions.None)[0]);
                    name1.Add(array[i].Split(splitter, StringSplitOptions.None)[1].Split(new string[] { "</a>" }, StringSplitOptions.None)[0]);
                }

                for (int i = 0; i < name1.Count; i++)
                {
                    Result1.Add(name1[i].ToString()); ;
                }
                return Result1;
            }
            catch(Execption e)
            {
                MessageBox.Show(e.ToString());
                return null;
            }       
        }
        
        //Takes the Index of the Item in the ListBox and returns
        //A string array of prices and the picture.
        public string[] GetPrice(int ItemIndex)
        {
            try
            {
                string[] ReturnPrices = new string[6];
                int index = ItemIndex;
                string[] price = new string[3];
                string[] array;
                string[] splitter = new string[] { "price: " };
                if (index != -1)
                {
                    string page = GetFile("http://itemdb-rs.runescape.com/viewitem.ws?obj=" + id[index]);
                    array = page.Split(splitter, StringSplitOptions.None);
                    splitter = new string[] { "</span>" };
                    for (int i = 0; i < 3; i++)
                    {
                        price[i] = array[i + 1].Split(splitter, StringSplitOptions.None)[0];
                    }

                    Regex Regex = new Regex("\\d{4}_obj_big.gif?");
                    Match match = Regex.Match(page);
                    string matchResult = match.Value;
                    string DynamicId = matchResult.Remove(4);

                    ReturnPrices[0] = "Name: " + Result[index];
                    ReturnPrices[1] = "ID: " + id[index];
                    ReturnPrices[2] = "Minimum Price: " + price[0];
                    ReturnPrices[3] = "Market Price: " + price[1];
                    ReturnPrices[4] = "Maximum Price: " + price[2];
                    ReturnPrices[5] = GetImage(Convert.ToString(id[index]), DynamicId);
                }

                return ReturnPrices;
            }
            catch(Execption e)
            {
                MessageBox.Show(e.ToString());
                return null;
            }
        }
        
        //Gets the Image of Item with the ItemID and returns the path to the saved image.
        private string GetImage(string ItemID,string imageDynId)
        {
            try
            {
                DirectoryInfo Folder = new DirectoryInfo(Directory.GetCurrentDirectory() + @"\GeImages\");

                //Check to see if that folder is there if not
                //create it.
                if (!Folder.Exists)
                {
                    Folder.Create();
                }

                //Check to see if the file has been downloaded before
                //if not download it, if so return the path.
                if (!File.Exists(Directory.GetCurrentDirectory() + @"\GeImages\" + ItemID + ".gif"))
                {
                    WebClient objClient = new WebClient();
                    objClient.DownloadFile(@"http://itemdb-rs.runescape.com/" + imageDynId + "_obj_big.gif?id=" + ItemID, Directory.GetCurrentDirectory() + @"\GeImages\" + ItemID + ".gif");
                }


                return Directory.GetCurrentDirectory() + @"\GeImages\" + ItemID + ".gif";
            }
            catch(Execption e)
            {
                MessageBox.Show(e.ToString());
                return null;
            }
        }

        public string[] GetGraph(string ItemID)
        {
            try
            {
                DirectoryInfo Folder = new DirectoryInfo(Directory.GetCurrentDirectory() + @"\GeImages\");

                //Check to see if that folder is there if not
                //create it.
                if (!Folder.Exists)
                {
                    Folder.Create();
                }

                string page = GetFile("http://itemdb-rs.runescape.com/viewitem.ws?obj=" + ItemID);
                Regex Regex = new Regex("\\d{4}_graphimg.gif?");
                Match match = Regex.Match(page);
                string matchResult = match.Value;
                string graphDynId = matchResult.Remove(4);

                Uri File1 = new Uri("http://itemdb-rs.runescape.com/" + graphDynId + "_scaleimg.gif?id=" + ItemID + "&scale=0&axis=0");
                Uri File2 = new Uri("http://itemdb-rs.runescape.com/" + graphDynId + "_graphimg.gif?id=" + ItemID + "&scale=0");
                Uri File3 = new Uri("http://itemdb-rs.runescape.com/" + graphDynId + "_scaleimg.gif?id=" + ItemID + "&scale=0&axis=2");

                WebClient objClient = new WebClient();
                objClient.DownloadFile(File1, Directory.GetCurrentDirectory() + @"\GeImages\" + ItemID + "Graph_Scale1.gif");
                objClient.DownloadFile(File2, Directory.GetCurrentDirectory() + @"\GeImages\" + ItemID + "Graph_Graph.gif");
                objClient.DownloadFile(File3, Directory.GetCurrentDirectory() + @"\GeImages\" + ItemID + "Graph_Scale2.gif");

                return new string[3] {Directory.GetCurrentDirectory() + @"\GeImages\" + ItemID + "Graph_Scale1.gif", Directory.GetCurrentDirectory() + @"\GeImages\" + ItemID + "Graph_Graph.gif", Directory.GetCurrentDirectory() + @"\GeImages\" + ItemID + "Graph_Scale2.gif"};
            }
            catch(Exception e)
            {
                MessageBox.Show(e.ToString());
                return null;
            }
        }        
    }
}