Create automated sitemap using asp.net

Task: Create automated sitemap dynamically using asp.net generic web handler.

Description: In E-Commerce website or blog we need to update sitemap regularly, instead of generating sitemap using third-party tool, we can generate sitemap dynamically using asp.net. Using "ashx" generic handler we can generate xml sitemap & using url rewriting we can rewrite "sitemap.ashx" for "sitemap.xml" request.

<%@ WebHandler Language="C#" Class="sitemap" %>

using System;

using System.Web;

using System.Text;

using System.Data;

public class sitemap : IHttpHandler {

    string currentTime = DateTime.Now.ToString("yyyy-MM-ddTHH:mm:ssZ");

    public void ProcessRequest (HttpContext context) {

        context.Response.ContentType = "text/xml";

        context.Response.Cache.SetCacheability(HttpCacheability.NoCache);

        context.Response.Cache.SetAllowResponseInBrowserHistory(true);

        context.Response.Charset = "UTF-8";

        context.Response.Write("<?xml version='1.0' encoding='UTF-8'?><urlset xmlns='http://www.sitemaps.org/schemas/sitemap/0.9'>");

        context.Response.Write(sitemap());

        context.Response.Write("</urlset>");

    }

    public bool IsReusable {

        get {

            return false;

        }

    }

    public string sitemap()

    {

        string weburl = "http://hemantrautela.blogspot.com/";

        System.Text.StringBuilder sitemap = new System.Text.StringBuilder();

        sitemap.Append(@"<url>

        <loc>" + weburl + @"</loc>

        <lastmod>"+currentTime+@"</lastmod>

        <priority>1.00</priority>

        </url>");

        // Append more url in your sitemap here using database

        return sitemap.ToString();

    }