1:  public class URLRewriterModule : IHttpModule
   2:      {
   3:          /// <summary>
   4:          /// You will need to configure this module in the web.config file of your
   5:          /// web and register it with IIS before being able to use it. For more information
   6:          /// see the following link: http://go.microsoft.com/?linkid=8101007
   7:          /// </summary>
   8:          #region IHttpModule Members
   9:   
  10:          public void Dispose()
  11:          {
  12:              //clean-up code here.
  13:          }
  14:   
  15:          public void Init(HttpApplication context)
  16:          {
  17:              // Below is an example of how you can handle LogRequest event and provide 
  18:              // custom logging implementation for it
  19:              context.BeginRequest += new EventHandler(context_BeginRequest);
  20:          }
  21:   
  22:          private void context_BeginRequest(object sender, EventArgs e)
  23:          {
  24:              System.Web.HttpApplication app = (System.Web.HttpApplication)sender;
  25:              string requestedUrl = app.Request.Path.ToLower();
  26:              string realUrl = GetRealUrl(requestedUrl);
  27:              if (!String.IsNullOrEmpty(realUrl))
  28:                  app.Context.RewritePath(realUrl, false);
  29:          }
  30:   
  31:          private string GetRealUrl(string requestedUrl)
  32:          {
  33:              // Implement your own logic here
  34:              
  35:              return GetRealPath(requestedUrl);
  36:   
  37:          } 
  38:   
  39:          #endregion
  40:   
  41:   
  42:          public string GetRealPath(string requestedUrl)
  43:          {
  44:              string path = "";
  45:              Dictionary<string, string> paths = GetPathsFromDatabase();
  46:              if (paths.ContainsKey(requestedUrl))
  47:                  paths.TryGetValue(requestedUrl, out path);
  48:              return path;
  49:          }
  50:   
  51:          private static Dictionary<string, string> GetPathsFromDatabase()
  52:          {
  53:              Dictionary<string, string> paths = new Dictionary<string, string>();
  54:              paths.Add("/Inicio", "/index.aspx");
  55:              paths.Add("/Inicio/", "/index.aspx");
  56:              
  57:              //paths.Add("/dev/Categorias/40/La-Ambientacion.aspx".ToLower(), "/dev/Subcategorias.aspx?CategoryID=40");
  58:              //paths.Add("/Categorias/SecondSection/Default.aspx".ToLower(), "/URLRewrite/Default.aspx?SectionID=2");
  59:              //paths.Add("/Categorias/FirstSection/Page1.aspx".ToLower(), "/URLRewrite/Default.aspx?SectionID=1&Item=1");
  60:              //paths.Add("/Categorias/FirstSection/Page2.aspx".ToLower(), "/URLRewrite/Default.aspx?SectionID=1&Item=2");
  61:              //paths.Add("/Categorias/SecondSection/Page1.aspx".ToLower(), "/URLRewrite/Default.aspx?SectionID=2&Item=1");
  62:              //paths.Add("/Categorias/SecondSection/SubSection/AnotherOne/Page5.aspx".ToLower(), "/URLRewrite/Default.aspx?SectionID=2&Item=5");
  63:              //paths.Add("/Quienes_Somos/".ToLower(), "/quienes_somos.aspx");
  64:              //paths.Add("/dev/Quienes_Somos/".ToLower(), "/quienes_somos.aspx");
  65:              return paths;
  66:          } 
  67:   
  68:      }