Ajax Tutorial for Beginners with XML & JSON: Part 2

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.Xml;
using System.Collections.Generic;

public partial class FetchWeather : System.Web.UI.Page
{	
    protected void Page_Load(object sender, EventArgs e)
    {
		string type = Request.QueryString["type"];
		string city = Request.QueryString["city"];
		string weatherIcon = "<img src='weathericon.JPG' alt='weather' />";
		List<KeyValuePair<string, string>> list2Ret = new List<KeyValuePair<string, string>>();

		if ( type == null )
			type = "XML";

		string xmlPath = Server.MapPath( "." ) + "\\WeatherDetails.xml";

		XmlDocument doc = new XmlDocument();
		doc.Load( xmlPath );
		XmlNodeList nodeList;		

		if ( type == "XML" )
		{
			nodeList = doc.SelectNodes( "weatherdetails/weatherreport" );

			foreach ( XmlNode node in nodeList )
			{
				list2Ret.Add( new KeyValuePair<string, string>( node.Attributes["city"].InnerText.ToLower(), node.Attributes["weather"].InnerText ) );
			}

			for ( int i = 0; i < list2Ret.Count; i++ )
			{
				if ( list2Ret[i].Key == city.ToLower() )
					Response.Write("<br>Weather Report using XML <br>  "+ list2Ret[i].Value + "<sup>o</sup> C"+ weatherIcon );
			}			
		}
		else if ( type == "JSON" )
		{
			string toJSON = byLibrary.byComponent.XmlToJSON( doc );
			Response.Write( toJSON );
		}		
    }
}