using System;
  using System.Data;
  using System.Configuration;
  using System.Collections;
  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.Net;
  using System.IO;
  using System.Text;
  using System.Text.RegularExpressions;
  using System.Xml;
  
  public partial class fs : System.Web.UI.Page
  {
  
      private WebRequest _amazonRequest;
      private WebRequest _yahooRequest;
      private WebRequest _ebayRequest;
  
      private XmlDocument _amazonDoc;
      private XmlDocument _yahooDoc;
      private XmlDocument _ebayDoc;
  
      private bool _insufficientArguments = false;
  
      protected void Page_Load(object sender, EventArgs e)
      {
          string strKeywords = Request.QueryString["Keywords"]; // Keywords
  
          if ((strKeywords != "") & (strKeywords != null))
          {
              PageAsyncTask amazonTask = new PageAsyncTask(
                  new BeginEventHandler(BeginAmazonAsyncOperation),
                  new EndEventHandler(EndAmazonAsyncOperation),
                  new EndEventHandler(TimeoutAmazonAsyncOperation),
                  null);
              RegisterAsyncTask(amazonTask);
              
              PageAsyncTask ebayTask = new PageAsyncTask(
                  new BeginEventHandler(BeginEbayAsyncOperation),
                  new EndEventHandler(EndEbayAsyncOperation),
                  new EndEventHandler(TimeoutEbayAsyncOperation),
                  null);
              RegisterAsyncTask(ebayTask);
  
              PageAsyncTask yahooTask = new PageAsyncTask(
                  new BeginEventHandler(BeginYahooAsyncOperation),
                  new EndEventHandler(EndYahooAsyncOperation),
                  new EndEventHandler(TimeoutYahooAsyncOperation),
                  null);
              RegisterAsyncTask(yahooTask);
  
              
          }
          else
          {
              _insufficientArguments = true;
          }
      }
  
      protected void Page_PreRenderComplete(object sender, EventArgs e)
      {
          try
          {
              // This is the last thing to happen
  

///////////////////////

              if (_insufficientArguments)
              {
                  // do nothing
              }
              else
              {                
                  // Merge the results of all 3 calls
                  XmlDocument resultsDoc = new XmlDocument();
                  XmlNode cont = resultsDoc.CreateElement("BaeBo");
                  resultsDoc.AppendChild(cont);
  
                  // first document to merge
                  XmlNode imported;
                  if (_amazonDoc != null)
                  {
                      imported = resultsDoc.ImportNode(_amazonDoc.DocumentElement, true);
                      resultsDoc.DocumentElement.AppendChild(imported);
                  }
  
                  // second document to merge
                  if (_yahooDoc != null)
                  {
                      imported = resultsDoc.ImportNode(_yahooDoc.DocumentElement, true);
                      resultsDoc.DocumentElement.AppendChild(imported);
                  }
  
                  // third document to merge
                  if (_ebayDoc != null)
                  {
                      imported = resultsDoc.ImportNode(_ebayDoc.DocumentElement, true);
                      resultsDoc.DocumentElement.AppendChild(imported);
                  }
  
                  // print merged documents
                  if (resultsDoc != null)
                  {
                      Response.Clear();
                      Response.ContentType = "text/xml";
                      if (Request.QueryString["format"] == "rss")
                      {
                          Response.Write(webUtility.TransformDoc(resultsDoc, "ayerss"));
                      }
                      else
                      {
                          Response.Write(webUtility.ConvertXmlToString(resultsDoc));
                      }
                      
                      //Response.Write(webUtility.TransformDoc(resultsDoc, "ayerss"));
                  }
              }
          }
          catch (Exception ex)
          {
              Response.Write("There was an error whilst merging your results. ");
              Response.Write(ex.Message);
          }        
          
      }
  
      protected override void  Render(HtmlTextWriter writer)
      {
          if (_insufficientArguments)
          {
              base.Render(writer);
          }
          else
          {
              // override and do nothing as in this case we're outputing XML
          }
      }
      
      IAsyncResult BeginAmazonAsyncOperation(object sender, EventArgs e, AsyncCallback cb, object state)
      {
          string strKeywords = webUtility.nvl(Request.QueryString, "Keywords");
          string strSearchIndex = webUtility.nvl(Request.QueryString, "SearchIndex");
          _amazonRequest = WebRequest.Create("http://webservices.amazon.com/onca/xml?Service=AWSECommerceService&AWSAccessKeyId=16KBB0XN5XP4WSNNVKG2&Operation=ItemSearch&ResponseGroup=Medium&AssociateTag=francshanacom&" + strKeywords + strSearchIndex);
          return _amazonRequest.BeginGetResponse(cb, state);
      }
  
      IAsyncResult BeginYahooAsyncOperation(object sender, EventArgs e, AsyncCallback cb, object state)
      {
          string strKeywords = Request.QueryString.Get("keywords");
          _yahooRequest = WebRequest.Create("http://api.shopping.yahoo.com/ShoppingService/V1/productSearch?appid=francisshanahan&results=10&query=" + strKeywords);
          return _yahooRequest.BeginGetResponse(cb, state);
      
      }
  
      IAsyncResult BeginEbayAsyncOperation(object sender, EventArgs e, AsyncCallback cb, object state)
      {
          string strKeywords = Request.QueryString.Get("keywords");
  
          _ebayRequest = WebRequest.Create("http://rest.api.ebay.com/restapi?CompatibilityLevel=445&CallName=GetSearchResults&RequestToken=UburRjOvd0Q%3D**25lhKIc3hPhgPpZ8ojZzv1TLm1I%3D&RequestUserId=francisshanahan&Schema=1&Currency=1&TrackingProvider=1&TrackingId=1889305&SearchInDescription=1&MaxResults=10&Query=" + strKeywords);
          return _ebayRequest.BeginGetResponse(cb, state);    
      }
  
      void EndAmazonAsyncOperation(IAsyncResult ar)
      {
          GetXml(_amazonRequest, ar, ref _amazonDoc);
      }
      void EndYahooAsyncOperation(IAsyncResult ar)
      {
          GetXml(_yahooRequest, ar, ref _yahooDoc);
      }
      void EndEbayAsyncOperation(IAsyncResult ar)
      {
          GetXml(_ebayRequest, ar, ref _ebayDoc);
      }
  
      void GetXml(WebRequest myReq, IAsyncResult myResult, ref XmlDocument myDoc)
      {
          using (WebResponse response = myReq.EndGetResponse(myResult))
          {
              using (StreamReader receiveStream = new StreamReader(response.GetResponseStream()))
              {
                  myDoc = new XmlDocument();
                  myDoc.Load(receiveStream);
              }
          } 
      }
  
      void TimeoutAmazonAsyncOperation(IAsyncResult ar) { Response.Write("Amazon Data temporarily unavailable"); }
      void TimeoutYahooAsyncOperation(IAsyncResult ar) { Response.Write("Yahoo Data temporarily unavailable"); }
      void TimeoutEbayAsyncOperation(IAsyncResult ar) { Response.Write("eBay Data temporarily unavailable"); }   
  }
  

[] readme course(s) preface I 1 2 II 3 4 III 5 6 7 IV 8 9 10 V 11 12 afterthought(s) appendix reference(s) example(s) resource(s) _

(C) Æliens 20/2/2008