Here’s the ASP.NET code for the instant search program (Bing first, then Twitter)

BING:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using Question.net.live.search;

namespace Question
{
    public partial class Instant : System.Web.UI.Page
    {
        // List of results from service
        List _results = new List();

        // Variables for search services
        private Question.net.live.search.api.LiveSearchService _service = new Question.net.live.search.api.LiveSearchService();
        private Question.net.live.search.api.SearchRequest _request = new Question.net.live.search.api.SearchRequest();
        private Question.net.live.search.api.SearchResponse _response = new Question.net.live.search.api.SearchResponse();

       protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                _request.AppId = "???"; // put your appId here
                Session["_request"] = _request;
                Session["_response"] = _response;
                Session["_service"] = _service;
            }
        }

        protected void RowDataBound(object sender, GridViewRowEventArgs e)
        {
            // As each row is bound, fill in the url and summary for the item

            if (e.Row.RowType == DataControlRowType.DataRow)
            {
                HyperLink hLink = new HyperLink();
                hLink.NavigateUrl = _results[e.Row.DataItemIndex].resultLink;

                // Only show portion of URL to avoid lenghty column
                if (hLink.NavigateUrl.Length < 33)
                {
                    hLink.Text = "(" + hLink.NavigateUrl.Substring(7, hLink.NavigateUrl.Length - 8) + ")";
                }
                else
                {
                    hLink.Text = "(" + hLink.NavigateUrl.Substring(7, 25) + "...)";
                }

                // Tooltip has the whole URL
                hLink.ToolTip = hLink.NavigateUrl;
                hLink.Target = "_blank";

                // Add url and result to cell
                TableCell myCell = e.Row.Cells[0];
                myCell.Controls.Add(hLink);
                myCell = e.Row.Cells[1];
                myCell.Style.Add("text-align", "left");
                myCell.Text = _results[e.Row.DataItemIndex].resultText;
            }
            else if (e.Row.RowType == DataControlRowType.Header)
            {
                e.Row.Cells[0].Text = " Link ";
                e.Row.Cells[1].Text = " Summary ";
            }
        }

        private void doSearch()
        {

            // Set source to Web or News depending on user selection
            switch (rbMode.SelectedValue)
            {
                case "Web":
                    _request = (Question.net.live.search.api.SearchRequest)Session["_request"];
                    _request.Sources = new Question.net.live.search.api.SourceType[] { Question.net.live.search.api.SourceType.Web};
                    break;
                case "News":
                    _request = (Question.net.live.search.api.SearchRequest)Session["_request"];
                    _request.Sources = new Question.net.live.search.api.SourceType[] { Question.net.live.search.api.SourceType.News };
                    break;
            }

            _service = (Question.net.live.search.api.LiveSearchService)Session["_service"];
            _request.Query = txtQuestion.Text;

            try
            {
                // Perform the search and get response
                _response = _service.Search(_request);

                // Fill results structure with results for Web or News
                switch (rbMode.SelectedValue)
                {
                    case "News":
                        if (_response.News.Results != null)
                        {
                            _results.Clear();
                            foreach (Question.net.live.search.api.NewsResult wr in _response.News.Results)
                            {
                                _results.Add(new ResultItem(wr.Url, wr.Snippet));
                            }
                        }
                        break;
                    case "Web":
                        if (_response.Web.Results != null)
                        {
                            _results.Clear();
                            foreach (Question.net.live.search.api.WebResult wr in _response.Web.Results)
                            {
                                _results.Add(new ResultItem(wr.Url, wr.Description));
                            }
                        }
                        break;
                }

                // Bind the gridview with data
                gvResults.DataSource = _results;
                gvResults.DataBind();
          }
            catch (Exception ex)
            {
                 // Just ignore errors for now.
            }

        }

        protected void txtQuestion_TextChanged(object sender, EventArgs e)
        {
            // Perform searches on Bing a
            doSearch();
            List tweets = TwitterSearch.Query(txtQuestion.Text);
            gvTwitter.DataSource = tweets;
            gvTwitter.DataBind();
        }

        protected void rbMode_SelectedIndexChanged(object sender, EventArgs e)
        {
            _results.Clear();
            gvResults.DataSource = _results;
            gvResults.DataBind();
            txtQuestion.Text = string.Empty;
        }

       }

}

TWITTER Code:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Xml.Linq;

namespace Question
{

    public class TwitterSearch
    {
        private const string _url = "http://search.twitter.com/search.atom?q={0}";
        private static XNamespace _atom = "http://www.w3.org/2005/Atom";

        public static List Query(string query)
        {
            XDocument xmlDoc = XDocument.Load(string.Format(_url, query));

            var tweets =
            (from tweet in xmlDoc.Descendants(_atom + "entry")
             select new Tweet
             {
                 Title = (string)tweet.Element(_atom + "title"),
                 Published =
                   DateTime.Parse((string)tweet.Element(_atom + "published")),
                 Link = tweet.Elements(_atom + "link")
                     .Where(link => (string)link.Attribute("rel") == "alternate")
                     .Select(link => (string)link.Attribute("href"))
                     .First()
             });

            return tweets.ToList();
        }

        public class Tweet
        {
            public string Id { get; set; }
            public DateTime Published { get; set; }
            public string Link { get; set; }
            public string Title { get; set; }
        }
    }

}