Source Code

for file /AJAXEngine/S03_AJAXControls/CarData.asmx

<%@ WebService Language="C#" Class="CarData" %>

using System;
using System.Web;
using System.Web.Caching;
using System.Web.Services;
using System.Web.Services.Protocols;
using System.Xml;

[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
public class CarData  : System.Web.Services.WebService {

  private const string CACHEENTRYNAME = "AjaxAspectsCars";
  private const string DataFileName = "cardata.xml";

  
  [WebMethod(Description = "Return Lookup entries that start with the given prefix.")]
  public string getModelsByClass(string carClass) { 
    XmlDocument data = Load();
    string ret = String.Empty;
    
    XmlNodeList xList = data.SelectNodes("/cardata/model[@title='" + carClass + "']/car");
    for (int n = 0; n < xList.Count; n++) {
      ret += ((XmlElement)xList[n]).GetAttribute("type");
      ret += ";";
    }
    return(ret);
  } // getModelsByClass

  #region private methods
  
  /// <summary>Get the current List of Orte and load if necessary.</summary>
  private static XmlDocument Load() {
    Cache c = HttpRuntime.Cache;
    XmlDocument store = (XmlDocument)c[CACHEENTRYNAME];

    if (store == null) {
      HttpContext ctx = HttpContext.Current;
      string fileName = ctx.Server.MapPath(DataFileName);
      System.Diagnostics.Trace.WriteLine("Load from File " + fileName);
      store = new XmlDocument();
      store.Load(fileName);
      
      c.Insert(CACHEENTRYNAME, store, new CacheDependency(fileName),
        Cache.NoAbsoluteExpiration,
        TimeSpan.FromMinutes(2));
    } // if
    return (store);
  } // Load

  #endregion
}

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For updates and discussions see http://ajaxaspects.blogspot.com/.