using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.Configuration;
namespace bitlink.Core
{
    public class URLmappings
    {
        public static bool AddUrlMapping(string NewVirtualPath, string RealPath)
        {
            HttpContext CurrentContext = HttpContext.Current;
            bool exists = false;
            Configuration config = WebConfigurationManager.OpenWebConfiguration
    (CurrentContext.Request.ApplicationPath);
            UrlMappingsSection section = (UrlMappingsSection)config.GetSection
    ("system.web/urlMappings");
            foreach (UrlMapping mapping in section.UrlMappings)
            {
                //loop
                if (mapping.Url.Equals(NewVirtualPath))
                {
                    exists = true;
                    return false;
                }
            }
            if (!exists)
            {
                section.UrlMappings.Add(new UrlMapping(
                     NewVirtualPath, RealPath));
                config.Save();
                return true;
            }
            return false;
        }
    }
}

 an example of how to use an inline sort function with a delegate to define the sort process 

public static List<Container.Speciality> getSpecialties()
{
    Kingsweb2DataAccess.Kingsweb2DataClassesDataContext newdb =
        new Kingsweb2DataAccess.Kingsweb2DataClassesDataContext();

    List<Container.Speciality> res =
        new List<Kingsweb2DataAccess.Container.Speciality>();
    var x = from m in newdb.specialities select m;
    foreach (Kingsweb2DataAccess.speciality xx in x)
    {
        res.Add(new Kingsweb2DataAccess.Container.Speciality(xx.Id));
    }

    res.Sort(delegate(Kingsweb2DataAccess.Container.Speciality a,
        Kingsweb2DataAccess.Container.Speciality b)
            { return a.Specialityname.CompareTo(b.Specialityname); });

    return res;
}

Open your Global.Asax file

If you don't have one ....
right click on your project / website and:
add -> new item  -> application configuration file

public override void Init()
{
    base.Init();
    HttpContext.Current.Response.Cache.SetCacheability(HttpCacheability.NoCache);
}