URL Mapping and HTTPModule , a SessionState problem

[somnathmali]

Suppose I have site xyz.com. Site has a page called show_user.aspx where I need to access the Session variables.
But this show_user.aspx page will not be called directly Instead , when user type xyz.com/somnath …it will interpret “somnath” as a user name and internally call page show_user.aspx? user=somnath.
I have created a HTTP module URLCheckingModu le for URL checking.
This is settings in my web.config file
…
<httpModules>
<add name="Session" type="System.We b.SessionState. SessionStateMod ule"/>
<add name="URLChecki ng" type="UserProfi leModule"/>
</httpModules>
<pages enableSessionSt ate="true" />
</system.web>
</configuration>

This is my class code
using System;
using System.Data;
using System.Configur ation;
using System.Web;
using System.Web.Secu rity;
using System.Web.UI;
using System.Web.UI.W ebControls;
using System.Web.UI.W ebControls.WebP arts;
using System.Web.UI.H tmlControls;
using System.IO;
using System.Web.Sess ionState;

public class UserProfileModu le : IHttpModule
{
public void Init(HttpApplic ation app)
{
app.PreRequestH andlerExecute += new EventHandler(th is.OnPreRequest );
}

private void OnPreRequest(ob ject sender, EventArgs e)
{

HttpContext context = HttpContext.Cur rent;
HttpRequest request = context.Request ;
string FilePath = request.FilePat h;
string ext = Path.GetExtensi on(FilePath);

if (string.IsNullO rEmpty(ext) && !FilePath.EndsW ith("/"))
{
// suppose URL is http://xyz.com/somnath/
// and empty Extension
string q = request.QuerySt ring.ToString() ;
string path = request.FilePat h + "/" + (string.IsNullO rEmpty(q) ? "" : q);
context.Server. Transfer("show_ user.aspx" );
}
else
{
if (FilePath.EndsW ith("/"))
{
string dPath;
dPath = context.Server. MapPath(FilePat h);
if (Directory.Exis ts(dPath) == false)
{
FilePath = FilePath.Remove (FilePath.Lengt h - 1, 1);
context.Respons e.Redirect(File Path);
}
}
}
}

public void Dispose()
{
}
}

Now,

If in the show_user.aspx, works well, if I don’t have any session related calls, but gives error if I want to work with Session.

Response.Write( Session["somnath"]);
// note I have set the Session in the default page.

Server Error in '/WebTest' Application.
_______________ _______________ __________
Session state can only be used when enableSessionSt ate is set to true, either in a configuration file or in the Page directive. Please also make sure that System.Web.Sess ionStateModule or a custom session state module is included in the <configuration> \<system.web>\< httpModules> section in the application configuration.

Note:
1. I have already set the Session module in Web.config.
2. To ensure that , Sessionstate should be available I have added Module at “PreRequestHand lerExecute” ,

AS per MSDN documentation Session state is available in this event.


I am stuck on this problem. Logically there is no reason to code to not work, as all steps are followed.
Please help me for this problem.