using System;
using System.Collections.Generic;
using System.Text;
using System.Web;
using System.IO;
namespace myModules
{
    class Trigger:IHttpModule
    {
        public void Init(System.Web.HttpApplication context)
        {
            context.EndRequest += new EventHandler(this.EndRoutine);
        }
        public void EndRoutine(object o, EventArgs e)
        {
            HttpApplication myApp;
            myApp = (HttpApplication)o;
            HttpContext c = myApp.Context;
            if (myApp.Context.AllErrors != null)
            {
                StreamWriter sw = new StreamWriter("C:\\Temp\\ErrorList.txt", true);
                foreach (Exception ex in myApp.Context.AllErrors)
                {
                    sw.WriteLine("Error occurred at #{0}", DateTime.Now.ToString());
                    sw.WriteLine("Error occurred in page #{0}", c.Request.FilePath);
                    sw.WriteLine(ex.InnerException.Message);
                    sw.WriteLine(ex.InnerException.StackTrace);
                    sw.WriteLine();
                }
                sw.Dispose();
            }
        }
        public void Dispose()
        {
            //Nothing to Dispose as of now
        }
    }
}

You can save the downloaded file to the bin folder of your web application and add the following to the web.config...

        <httpModules>
            <add name="Trigger" type="myModules.Trigger, myModules"/>
        </httpModules>

Here is the sample output (C:\Temp\ErrorList.txt) for one of the applications where I have used the Throw New AppDomainUnloadedException or similar lines to create the error...

Hope this helps,
Rahul

Quote of the day:
The nice thing about standards is that there are so many of them to choose from. - Andrew S. Tanenbaum

Posted at > 6:10 PM IST

myModules.zip

Scenario 9:Find out what is the peak time for your IIS Server

How can you find out what is the peak time (peak hour) for your Website using Logparser?

Answer:

Logparser "SELECT quantize(time,60), count(*) as Frequency from ex080716.log GROUP BY quantize(time,60) order by quantize(time, 60)" -rtp:-1

Here is a brief snapshot of my LogFile...

And here is the output...

QUANTIZE(time, 60) Frequency
------------------ ---------
02:37:00           4
02:38:00           3
02:39:00           8
02:40:00           55
02:41:00           215
02:45:00           40
02:46:00           36

Statistics:
-----------
Elements processed: 361
Elements output:    7
Execution time:     0.00 seconds

You may also try...

Logparser "SELECT quantize(time,60), count(*) as Frequency INTO Image.GIF from ex.log GROUP BY quantize(time,60) order by quantize(time, 60)"

Here is the output...

This tells me that 2:41 GMT is the Peak Minute for my web-site. If you want to get the details per hour... change the query to...

Logparser "SELECT quantize(time,3600), count(*) as Frequency INTO Image.GIF from ex.log GROUP BY quantize(time,3600) order by quantize(time, 3600)"

As you can easily figure out, my site doesn't have too many hits after all

Hope this helps...
Rahul

Quote of the day:
People who have no weaknesses are terrible; there is no way of taking advantage of them. - Anatole France

Posted at > 10:07 AM IST

1. Create a page called RunBatchFile.vb and paste the following...

Imports System.Diagnostics
Imports System.IO
Partial Class RunBatchFile
    Inherits System.Web.UI.Page
    Dim _password As New System.Security.SecureString
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        Dim password As String
        'Read from any Registry or Encrypted config file if you like for added security.
        password = "YOUR___PASSWORD"  
        For Each c As Char In password
            _password.AppendChar(c)
        Next
        Dim strFilePath As String = "c:\\temp\\test.bat"
        Dim psiMyProcess As ProcessStartInfo = New ProcessStartInfo("cmd.exe")
        psiMyProcess.LoadUserProfile = True
        psiMyProcess.UserName = "Administrator"
        psiMyProcess.Password = _password
        psiMyProcess.UseShellExecute = False
        psiMyProcess.CreateNoWindow = True
        psiMyProcess.RedirectStandardOutput = True
        psiMyProcess.RedirectStandardInput = True
        psiMyProcess.RedirectStandardError = True
        psiMyProcess.WorkingDirectory = "c:\\temp\\"
        Dim prcProcess As Process = Process.Start(psiMyProcess)
        Dim strm As StreamReader = File.OpenText(strFilePath)
        Dim strOut As StreamReader = prcProcess.StandardOutput
        Dim strIn As StreamWriter = prcProcess.StandardInput
        Do While strm.Peek() <> -1
            strIn.WriteLine(strm.ReadLine())
        Loop
        strm.Close()
        strIn.WriteLine(String.Format("# {0} ran successfully. Exiting now!", strFilePath))
        strIn.WriteLine("Exit")
        prcProcess.Close()
        Dim strOutput As String = strOut.ReadToEnd().Trim()
        strIn.Close()
        strOut.Close()
        Response.Write(String.Format("<font face=courier size=0>{0}</font>", _
                strOutput.Replace(System.Environment.NewLine, "<br>")))
    End Sub
End Class

2. The batch file that I have is a one liner (and a no-brainer)... [Here, one and two are folders containing a few files]

xcopy one\*.* two /y

3. If everything is in place, you should get something like this as output...

Hope this helps,
Rahul

What would you do in those situations??

I know there is not a single correct answer to this question and it is scenario specific. Let me show you one little trick which might help you while troubleshooting your web-applications. This application (module) is no-where near completion... it just shows you how you can use Modules to troubleshoot the issue. You can tweak the code based on your scenario and work accordingly. I will share the plain httpmodule in this post. Once I am done with this module with lots of other automated configuration stuff (like capturing all viewstate, session information, etc), I will update my blog accordingly.

Let's proceed by creating a class Library (I will call it myModules)

1. Add a reference to System.Web
2. Copy the following in a new class file called Trigger.cs

using System;
using System.Collections.Generic;
using System.Text;
using System.Web;
namespace myModules
{
    class Trigger:IHttpModule
    {
        DateTime fTimerValue;
        public void Init(System.Web.HttpApplication context)
        {
            context.BeginRequest += new EventHandler(this.BeginRoutine);
            context.EndRequest += new EventHandler(this.EndRoutine);
        }
        public void BeginRoutine(object o, EventArgs e)
        {
            fTimerValue = DateTime.Now;
        }
        public void EndRoutine(object o, EventArgs e)
        {
            HttpApplication myApp;
            TimeSpan t = TimeSpan.MinValue;
            myApp = (HttpApplication)o;
            HttpContext c = myApp.Context;
            if(c.Response.StatusCode == 200)
            {
                t = DateTime.Now - fTimerValue;
                if (t.TotalSeconds > 5)
                {
                    c.Response.Write("Tweak this page!! It took... " + t.TotalSeconds + " seconds");
                    c.Response.Write("<BR>");
                    c.Response.Write("Name > " + c.Request.PhysicalPath);
                    return;
                }
            }
            myApp.Context.Response.Write("This response took " + t.ToString() + " seconds");
        }
        public void Dispose()
        {
            //Nothing to Dispose as of now
        }
    }
}

        <httpModules>
            <add name="Trigger" type="myModules.Trigger, myModules"/>
        </httpModules>

5. I tried this with an Empty project. And introduced Sleep statement in the Page_Load...

    protected void Page_Load(object sender, EventArgs e)
    {
        System.Threading.Thread.Sleep(26000);
    }

The output is...

 
As I said earlier... this is a very meager output, and not enough to fix the issue. But now that you know how to use Modules to troubleshoot your application, feel free to tweak around the code and fix the issue at hand.

Happy troubleshooting!
Rahul

Now... I don't know which of these Samples should I click on (since I have two in the list!). Anyway, there are multiple reasons why you would like to remove the junk entries from this list. One way is to open the Registry and navigate to HKEY_CURRENT_USER\Software\Microsoft\VisualStudio\9.0\ProjectMRUList. This list contains all the values you are looking for. Delete the values which you don't like and restart Visual Studio.

Another way, which I think is a smarter one is to download this ZIP and do the following...

1. Extract it anywhere in your machine.
2. Open Visual Studio, click on Tools -> External Tools...
3. Click on Add button and in the Title field, write "Clear Recently Used List"
4. In the Command Line, browse to the <SAVED__PATH>\ClearRecentItems.exe and click on OK.


4. Now, you should have this tool listed on your Tools Menu in VS 2008.

5. Here is the sample output...

Feel free to download the code for this small utility...

Hope this helps,
Rahul

The problem with the line break is that it increases the overhead and time spent on the blogger's part in formatting the post. Apart from that, it also creates chances of typos which would make that code snippet not compile when an end user tries it.

Let's say I have a piece of code which I want to blog about (in Windows Live Writer)...

I use Paste from Visual Studio plugin and really love it. When I paste my code from Visual Studio using the Plugin, here is what I get...

<%@ Page Language="C#" %>
<%@ Import Namespace="System.Reflection" %>
<%@ Import Namespace="System.Drawing" %>
<!DOCTYPE html 'I am making this line even longer' PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "https://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<%@ OutputCache Duration="72000" VaryByParam="none"  Location="Any" %>

See how the 4th line overflows! Not good, right? So, what next???

Noooo... please don't split that line.....

Select View -> HTML Code and add the DIV tag as follows around the code.

<div style="overflow: scroll">

Your Code Or Image.

</div>

Here is the output...

<%@ Page Language="C#" %>
<%@ Import Namespace="System.Reflection" %>
<%@ Import Namespace="System.Drawing" %>
<!DOCTYPE html 'I am making this line even longer' PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "https://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<%@ OutputCache Duration="72000" VaryByParam="none"  Location="Any" %>

Hope this helps,
Rahul

UPDATE> Going forward I will be posting on www.dotnetscraps.com. It will give me much more flexibility in hosting the code and do some of the other things that I have in my mind for quite some time now.

---------------------------
Microsoft Visual Studio
---------------------------
The application for project 'H:\Downloads\AjaxControlToolkit\SampleWebSite' is not installed.

Make sure the application for the project type () is installed.
---------------------------
OK   Help  
---------------------------

To get rid of it, open the SLN file directly from File -> Open -> Project/Solution. Create a backup if you like (when prompted!).

You may also get the following error while trying to compile the Solution...

Parser Error Message: Could not load file or assembly 'System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified.

This is because, you probably didn't install the AJAXControl Toolkit. Get it from here.

Another error that you could encounter is...

error : Could not load file or assembly 'vjslib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified.
Done building project "TemplateVSI.csproj" -- FAILED.

Install JS Redist from here and you should be good.

Cheers,
Rahul

Apparently a few things changed with WLW and I am still investigating if there is a way to make this work in a Non-Admin mode. I will keep you posted if I discover the root cause.

Thanks,
Rahul

We will continue to have our own blogs, but going forward you will see a lot of good information about troubleshooting IIS 7 and ASP.NET from a bunch of really talented folks. Feel free to subscribe to our new team blog  and let me know if you would like to see some more topics that you require help on. It could be anything from simple to complex, related to IIS 7 or ASP.NET. Our focus is not only knowledge sharing, but also sharing some of the troubleshooting skills that we acquire because of handling multiple complex issues as a part of our job.

Definitely, I won't have all the answers, but I am priviledged to be working with quite a lot of smart folks who do !!

As an insider let me tell you that we are coming up with a lot of posts which will help you create different modules with IIS 7. Give us a lot of hits on the new blog </shameless promotion of our team ends!>)

Cheers,
Rahul

Scenario 8: Checking the traffic/requests between a specific client and server

Why would you do it in the first place?
You may want to troubleshoot an authenticate issue for that specific client for the error that s/he reported to you. May be that's why!

Answer:

Logparser "select date, time, c-ip, cs-username, s-sitename, s-computername, s-ip, s-port, cs-method, cs-uri-stem, cs-uri-query, sc-status, sc-substatus,sc-win32-status, sc-bytes, cs-bytes, time-taken,cs-version, cs-host, cs(User-Agent), cs(Cookie), cs(Referer), s-event, s-process-type, s-user-time, s-kernel-time, s-page-faults, s-total-procs, s-active-procs, s-stopped-procs from <FILENAME> where c-ip='Client-IP'" -i:IISW3C -rtp:-1

And the output will be something like...

Hope that helps,
Rahul