By-Teach4u.in

Content1. Web.config2. Why Applications?3. IIS

1. Role in handing a request4. .NET

1. Applications2. Application Object 3. Global.asax

5. Configuration files1. Machine.config2. Web.Config

What is Web.Config File? Configuration file is used to manage various

settings that define a website. The settings are stored in XML files that are separate from your application code. In this way you can configure settings independently from your code. Generally a website contains aingle Web.config file stored inside the application root directory. However there can be many configuration files that manage settings at various levels within an application.

Why Applications?Dark ages (pre-2003)

Server crashes not unusual Single failure bring down whole system

Worse yet: Memory leaks

Cause IIS hang Stop serving pages

Required manual intervention(reboot)

Why ApplicationsToday (Windows Server 2003 & later)

Applications still crash Applications are compartmentalized OS handles gracefully

System rarely affectedOS monitors application health

Recycles unhealthy processesResult: system stable & reliable

IIS Overview

IIS ApplicationsFolders may be configured as “Applications”

IIS configuration interfaceEach application is assigned to an Application Pool

Each application pool has a unique Windows processSpecify error handling, timeouts, etc. for each

application

Benefit:Compartmentalize applicationsReduces dependencies

Improves reliabilityAllows application specific settings

Error handling, log files, filters, headers, timeouts… 100’s of settings

Applications SettingsConfiguration settings:

Web.config Application level settings Located in root folder

Machine.config Settings common to all applications

Application event handlersGlobal.asax file

Located in root folder

ASP.NET Configuration.config files

Hierarchical configurationSimilar to CSS

Inheritance Child has precedence over parent

Machine.configRarely need to modify

Web.ConfigXML file

Case sensitiveCamel casing

Configure:Application settingsError handlingTimeoutsSessions…etc. etc.Authenticationdocumentation

Security .config files not served

Global.asaxHandles application & session events

15+ events Application_startApplication_errorSession_start

Located in root folder of applicationTriggered each page requestOptional

Global.asaxExample:

Create new application on serverweb.config: sourceglobal.asax: sourceTestPage.aspx: source, output

SummaryConfiguration Objectives:

Flexibility Security Reliability Convenience

IIS Handles requests

Application Application object Events: global.asax

Configuration Machine.config Web.config