1. Module 6:
Tracing in Microsoft
ASP.NET Web
Applications

2. Overview
 Understanding Tracing
 Remote Debugging

3. Understanding Tracing
 Runtime Information
 Enabling Tracing
 Using the Trace Object
 Viewing Trace Results
 Using Application-Level Trace
 Demonstration: Tracing Through a Web Application
 Tracing into a Component

4. Runtime Information
 During runtime, you can:
 Output values of variables
 Assert whether a condition is met
 Trace through the execution path of the application
 You can collect runtime information using:
 The Trace object
 The Debug object

5. Enabling Tracing
 Page-level tracing displays trace statements only on the configured
page
 Enabling page-level tracing
<%@ Page Language="vb" Trace="true" %>
<%@ Page Language="c#" Trace="true" %>
 Application-level tracing displays trace information for all pages in a
Web application
 Enabling application-level tracing in the Web.config file
<trace enabled="true" pageOutput="true"
localOnly="true"/>
 Practice: Check default settings

6. Using the Trace Object
 Inserting trace messages
Trace.Write ("category", "message")
Trace.Warn ("category", "message")
 Conditional execution with Trace.IsEnabled
If Trace.IsEnabled Then
strMsg = "Tracing is enabled!"
Trace.Write("myTrace", strMsg)
End If
if (Trace.IsEnabled)
{
strMsg = "Tracing is enabled!";
Trace.Write("myTrace", strMsg);
}
 Dynamically change state of trace
Trace.IsEnabled = False

7. Viewing Trace Results

8. Using Application-Level Trace
Page Application Result
Trace=True or
Trace=True  Trace results are displayed on page
Trace=False
Trace=True or
Trace=False  Trace results are not displayed
Trace=False
Trace not set Trace=True  Trace results are displayed on page
 Application-level trace statements are displayed on
individual pages
 Set pageOutput=false in the Web.config file and trace
results are viewable by trace viewer
http://server/project/trace.axd

9. Demonstration: Tracing Through a Web Application
 Page-level tracing
 Application-level tracing

10. Tracing into a Component
 Import the System.Web Library
Imports System.Web using System.Web;
 Enable Tracing
HttpContext.Current.Trace.IsEnabled = True
HttpContext.Current.Trace.IsEnabled = true;
 Call Trace methods
HttpContext.Current.Trace.Write _
("component", "this is my trace statement")
HttpContext.Current.Trace.Write
("component", "this is my trace statement");

11. Lesson: Remote Debugging
 How to Perform Remote Debugging

12. How to Perform Remote Debugging
 Remote debugging:
 Debug Web applications remotely
 Simplifies team development
 Simplifies Web site management
 Requirements for remote debugging:
 Requires Visual Studio .NET or remote components on the
server
 Visual Studio .NET must be installed on the client
 Requires administrative access to the server
 Requires access for the user who is performing debugging

13. Review
 Understanding Tracing
 Remote Debugging

14. Lab 6: Tracing in Microsoft ASP.NET Web
Applications
Logon Page
Login.aspx
Benefits
Coho Home Page Page Header ASPState
Winery Default.aspx Header.ascx
Menu
Registration Component
Register.aspx Class1.vb or Class1.cs Web.
tempdb
config
Life Insurance Retirement Medical Dental
Life.aspx Retirement.aspx Medical.aspx Dental.aspx
Prospectus Doctors User Control XML Web
Lab Web Prospectus.aspx Doctors.aspx namedate.ascx Service
Application dentalService1.asmx
XML
Doctors Dentists
Files