Build a Google IG like AJAX Start Page in 7 days using ASP.NET AJAX and .NET 3.0

using System;
using System.Data;
using System.Configuration;
using System.Collections.Generic;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Query;
using System.Xml.XLinq;
using System.Xml;
using System.Data.DLinq;

public partial class FlickrWidget : System.Web.UI.UserControl, IWidget
{

    private const string FLICKR_API_KEY = "c705bfbf75e8d40f584c8a946cf0834c";
    private const string MOST_RECENT ="http://www.flickr.com/services/rest/?method=flickr.photos.getRecent&api_key="+FLICKR_API_KEY;
    private const string INTERESTING = "http://www.flickr.com/services/rest/?method=flickr.interestingness.getList&api_key="+FLICKR_API_KEY;
    private const string ENTER_TAG ="http://www.flickr.com/services/rest/?method=flickr.photos.search&api_key="+FLICKR_API_KEY+"&tags=";
    private const string FIND_BY_USERNAME = "http://www.flickr.com/services/rest/?method=flickr.people.findByUsername&api_key="+FLICKR_API_KEY+"&username=";
    private const string FIND_BY_EMAIL = "http://www.flickr.com/services/rest/?method=flickr.people.findByEmail&api_key="+FLICKR_API_KEY+"&find_email=";
    private const string PHOTOS_FROM_FLICKR_USER = "http://www.flickr.com/services/rest/?method=flickr.people.getPublicPhotos&api_key="+FLICKR_API_KEY+"&user_id=";

    private int Columns = 3;
    private int Rows = 3;
    
    private IWidgetHost _Host;

    private int PageIndex
    {
        get 
        { 
            object val = ViewState[this.ClientID + "_PageIndex"];
            if( null == val ) return 0;
            else return (int)val;
        }
        set { ViewState[this.ClientID + "_PageIndex"] = value; }
    }
    protected void Page_Load(object sender, EventArgs e)
    {   
        if( this._Host.IsFirstLoad )
        {            
            this.LoadPictures();
            this.PageIndex = 0;
            this.ShowPictures(0);            
        }
        else
        {
            this.ShowPictures(this.PageIndex);            
        }
    }

    void IWidget.Init(IWidgetHost host)
    {
        this._Host = host;
    }

    void IWidget.ShowSettings()
    {
        settingsPanel.Visible = true;
    }
    void IWidget.HideSettings()
    {
        settingsPanel.Visible = false;
    }
    void IWidget.Minimized()
    {
    }
    void IWidget.Maximized()
    {
    }
    void IWidget.Closed()
    {
    }
    protected void mostRecentRadioButton_CheckedChanged(object sender, EventArgs e)
    {
        this.SaveState();
        this.LoadPictures();
    }

    private void SaveState()
    {
    }

    private string LoadPictures()
    {
        string url = mostRecentRadioButton.Checked ? MOST_RECENT : INTERESTING;
        string cachedXml = Cache[url] as string;
        if( string.IsNullOrEmpty(cachedXml ) )
        {
            try
            {
                var xroot = XElement.Load(url);
                Cache.Insert(url, xroot.Xml, null, DateTime.MaxValue, TimeSpan.FromMinutes(10));
                return xroot.Xml;
            }
            catch
            {
                return null;
            }
        }
        else
        {
            return cachedXml;
        }
    }

    private void ShowPictures(int pageIndex)
    {
        var xml = this.LoadPictures();
        if( string.IsNullOrEmpty(xml) ) return;
        var xroot = XElement.Parse(xml);
        var photos = (from photo in xroot.Element("photos").Elements("photo")
                    select new PhotoInfo
                    { 
                        Id = (string)photo.Attribute("id"),
                        Owner = (string)photo.Attribute("owner"),
                        Title = (string)photo.Attribute("title"),
                        Secret = (string)photo.Attribute("secret"),
                        Server = (string)photo.Attribute("server"),
                        Farm = (string)photo.Attribute("Farm"),
                        /*IsPublic = (bool)photo.Attribute("ispublic"),
                        IsFriend = (bool)photo.Attribute("isfriend"),
                        IsFamily = (bool)photo.Attribute("isfamily")*/
                    }).Skip(pageIndex*Columns*Rows).Take(Columns*Rows);
        
        HtmlTable table = new HtmlTable();
        table.Align = "center";
        var row = 0;
        var col = 0;
        var count = 0;
        foreach( var photo in photos )
        {
            if( col == 0 )
                table.Rows.Add( new HtmlTableRow() );

            var cell = new HtmlTableCell();
            
            var img = new HtmlImage();
            img.Src = photo.PhotoUrl(true);
            img.Width = img.Height = 75;
            img.Border = 0;

            var link = new HtmlGenericControl("a");
            link.Attributes["href"] = photo.PhotoPageUrl;      
            link.Attributes["Target"] = "_blank";
            link.Attributes["Title"] = photo.Title;
            link.Controls.Add(img);
            
            cell.Controls.Add(link);
            table.Rows[row].Cells.Add(cell);

            col ++;
            if( col == Columns )
            {
                col = 0; row ++;
            }

            count ++;
        }

        photoPanel.Controls.Clear();
        photoPanel.Controls.Add(table);

        if( pageIndex == 0 )
        {
            this.ShowPrevious.Visible = false;
            this.ShowNext.Visible = true;
        }
        else
        {
            this.ShowPrevious.Visible = true;
        }
        if( count < Columns*Rows )
        {
            this.ShowNext.Visible = false;
        }
    }
    protected void ShowPrevious_Click(object sender, EventArgs e)
    {
        this.PageIndex --;        
        this.ShowPictures(this.PageIndex);
    }
    protected void ShowNext_Click(object sender, EventArgs e)
    {
        this.PageIndex ++;
        this.ShowPictures(this.PageIndex);
    }
}