Google page rank class C#

Add this Class in project

using System;
using System.Data;
using System.Configuration;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Net;
using System.IO;
using System.Text.RegularExpressions;

/// <summary>
/// Summary description for GooglePR
/// </summary>
public class GooglePR
{
    public GooglePR()
    {

    }
    private const UInt32 myConst = 0xE6359A60;
    private static void Hashing(ref UInt32 a, ref UInt32 b, ref UInt32 c)
    {
        a -= b; a -= c; a ^= c >> 13;
        b -= c; b -= a; b ^= a << 8;
        c -= a; c -= b; c ^= b >> 13;
        a -= b; a -= c; a ^= c >> 12;
        b -= c; b -= a; b ^= a << 16;
        c -= a; c -= b; c ^= b >> 5;
        a -= b; a -= c; a ^= c >> 3;
        b -= c; b -= a; b ^= a << 10;
        c -= a; c -= b; c ^= b >> 15;
    }
    public static string PerfectHash(string theURL)
    {
        string url = string.Format("info:{0}", theURL);
        int length = url.Length;
        UInt32 a, b;
        UInt32 c = myConst;
        int k = 0;
        int len = length;
        a = b = 0x9E3779B9;
        while (len >= 12)
        {
            a += (UInt32)(url[k + 0] + (url[k + 1] << 8) +
                 (url[k + 2] << 16) + (url[k + 3] << 24));
            b += (UInt32)(url[k + 4] + (url[k + 5] << 8) +
                 (url[k + 6] << 16) + (url[k + 7] << 24));
            c += (UInt32)(url[k + 8] + (url[k + 9] << 8) +
                 (url[k + 10] << 16) + (url[k + 11] << 24));
            Hashing(ref a, ref b, ref c);
            k += 12;
            len -= 12;
        }
        c += (UInt32)length;
        switch (len)
        {
            case 11:
                c += (UInt32)(url[k + 10] << 24);
                goto case 10;
            case 10:
                c += (UInt32)(url[k + 9] << 16);
                goto case 9;
            case 9:
                c += (UInt32)(url[k + 8] << 8);
                goto case 8;
            case 8:
                b += (UInt32)(url[k + 7] << 24);
                goto case 7;
            case 7:
                b += (UInt32)(url[k + 6] << 16);
                goto case 6;
            case 6:
                b += (UInt32)(url[k + 5] << 8);
                goto case 5;
            case 5:
                b += (UInt32)(url[k + 4]);
                goto case 4;
            case 4:
                a += (UInt32)(url[k + 3] << 24);
                goto case 3;
            case 3:
                a += (UInt32)(url[k + 2] << 16);
                goto case 2;
            case 2:
                a += (UInt32)(url[k + 1] << 8);
                goto case 1;
            case 1:
                a += (UInt32)(url[k + 0]);
                break;
            default:
                break;
        }
        Hashing(ref a, ref b, ref c);
        return string.Format("6{0}", c);
    }
    public int MyPageRank(string MyUrl)
    {
        string HashDomain = PerfectHash(MyUrl);
        string RequestedURL = string.Format("http://toolbarqueries.google.com/" +
               "tbr?client=navclient-auto&ch={0}&features=Rank&q=info:{1}",
               HashDomain, MyUrl);
        try
        {
            HttpWebRequest HttpRequest = (HttpWebRequest)WebRequest.Create(RequestedURL);
            string GetResponse = new StreamReader(
                   HttpRequest.GetResponse().GetResponseStream()).ReadToEnd();
            if (GetResponse.Length == 0)
                return 0;
            else
                return int.Parse(Regex.Match(GetResponse,
                       "Rank_1:[0-9]:([0-9]+)").Groups[1].Value);
        }
        catch (Exception)
        {
            return -1;
        }
    }
}



and on code behind page
 protected void Page_Load(object sender, EventArgs e)
    {
GooglePR Gpr = new GooglePR();
Response.write(Gpr.MyPageRank(val));
}