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Performing ASP.NET

Administrative Tasks

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Configuration as ASP.NET Application

Debugging ASP.NET Application

Identifying ASP.NET Application Debugging Methods

Handling Internet Related Exceptions

Objective

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ASP.NET Configuration system is used to describe the

properties and behaviors of various aspects ofASP.NET applications

ASP.NET uses XML-based configuration system that ismore accessible and easier to use.

You can configure features, such as ConnectionStrings, Authentication Modes, Caching, Debug andTracing, Custom Errors and many more.

ASP.NET Configuration System

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ASP.NET configuration data is stored in two primary

XML-based files. These files allow you to easily edit configuration data

at any moment even after the application is deployedon server.

Configuration Files

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Machine.config: Server or machine-wide

configuration file Web.config: Application configuration files which deal

with a single application

Different types of Configuration files

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Every ASP.NET server installation includes a

configuration file named machine.config, and this fileis installed as a part of .NET Framework installation.

You can find machine.config inC:\\Microsoft.NET\Framework\\Config\

Server Configuration file (Machine.config)

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Each and Every ASP.NET application has its own copy

of configuration settings stored in a file calledWeb.config.

If the web application spans multiple folders, eachsub folder has its own Web.config file that inherits or

overrides the parent's file settings.

Application Configuration file (Web.config)

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Common section groups/settings present in the

configuration files. Connection Strings

Session State

Custom Errors

Authentication

Common Configuration Settings (Machine.config &Web.config)

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ASP.NET 2.0 introduces a new section called

that stores all kinds ofconnection-string information.

Connection Strings

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Session information using the element

It can be used to persist state in any permanent store like XML ordatabases

sessionStatemode ="StateServer"cookieless ="false"timeout ="20"

stateConnectionString="tcpip=aras02:42424"stateNetworkTimeout="60"sqlConnectionString =""/>

Session State

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When the ASP.NET application fails, the ASP.NET

page can show the default error page with the sourcecode and line number.

We can prevent this kind of error messages byconfiguring element which allows for

defining custom error messages in an ASP.NETapplication.

Custom Errors

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Every web application must store some application-

specific information for its runtime use. The"appSettings" section provides a way to definecustom application settings for an ASP.NETapplication.

Custom Application Specific

settings

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Debugging is the process of finding and fixing errors

in your application Two types of errors:

Compile time errors: these are largely syntactic errorswhich will be captured by the compiler. Note, that use

of Option Explicit and Option Strict can reduce thelikelihood of runtime errors via compile timeidentification of likely issues. See my article on ErrorHandling in ASP.NET for more information.

Runtime errors: these are bugs programs that compile

successfully but do not behave as expected.

Debugging An Application

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Debug mode may be set explicitly within the

web.config file

Debug Mode

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Stepping is the step-by-step execution of a program

The steps of the stepping process are definable by the developer. Thedebug menu of VS.NET provides three options for step execution:

Step Into: executes the code in step mode if a method call isencountered the program execution steps into the code in step mode.

Step Over: will not execute the next method call in step mode,continuing to the next statement after the method call.

Step Out: if already in a method call will continue through the rest ofthe method without stepping, returning to step mode when controlreturns to the calling statement.

Setting Breakpoints and Stepping Through ProgramExecution

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Watch

The Watch window allows you to add 'watches' to particularly variables and expression for continuousmonitoring. Thus when you set up a watch whenever you return to the IDE while debugging you will see

the current value of the variable or expression defined by the watch.

Autos

The autos window (automatically) displays the variables in the current statement and the previous

statement.

Locals

Displays the variables local to the current context, i.e. the current method under execution

Me

The Me window allows you to examine members associated with the current object typically a web

form for an ASP.NET application, but not necessarily. It also allows you to change these values.

Immediate

The immediate window allows (immediate) access to the values of variables and expressions while

debugging, at the breakpoint.

Call Stack

The Call Stack window shows you the method call stack thus providing information about the path

taken by the code to reach its current point of execution

.NET debugging tools

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Turning debugging on and off at the page level is easy

enough when you're making changes to only a fewpages

You can activate Debug mode at the application levelby setting the Debug attribute of the compilation

section in Web.config

Enabling Debugging at the Application Level

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The .NET framework provides a Debug object that

you can use to assist with debugging your application The Debug object is a member of

System.Diagnostics.Debug.

Using the Debug Object

private void Page_Load(Object Sender , EventArgs e)

{

Debug.Write("Application initializing. Poot.");

}

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A performance monitor is a feature of the Windows

NT/2000 operating system used to determineoperating system resource consumption in real-time

ASP.NET have their own set of performance monitorsthat broadcast meaningful information to the

operating system about resources consumed bythese services

.NET application can be equipped with performancemonitors that you create yourself, called custom

performance monitors

Creating Custom PerformanceMonitors

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Windows event log is a central, system-managed

place where any application, service, or device can loginformation.

ASP.NET applications, can access the event log. Yourapplications will write information to the application

log The .NET framework provides a class for handling the

event log. This is the EventLog class, found inSystem.Diagnostics.

Windows Event Log

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void Button1_Click(Object Sender, EventArgs e)

{ if(!EventLog.SourceExists("MyApp")) {EventLog.CreateEventSource("MyApp","Application"); } EventLog.WriteEntry("MyApp","This is just a test.", EventLogEntryType.Information);

}

Event to the Windows Event Log

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Tracing is a way to monitor the execution of your

ASP.NET application. You can record exception details and program flow in

a way that doesn't affect the program's output.

Tracing

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ASP.NET tracing can be enabled on a page-by-page

basis by adding "Trace=true" to the Page directive inany ASP.NET page

ASP.NET tracing can be enabled on a page-by-page basisby adding "Trace=true" to the Page directive in any

ASP.NET page you can add the TraceMode attribute that sets

SortByCategory or the default, SortByTime

Page level Tracing

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You can enable tracing for the entire application by adding tracing

settings in web.config.

In Above example, pageOutput="false" and requestLimit="20" are used, so

Application Tracing

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Tracing can be viewed for multiple page requests at the application level

by requesting a special page called trace.axd

protected void Page_Load(object sender, EventArgs e)

{

System.Diagnostics.Trace.Write("This is Page_Load method!");

Viewing Trace Data