Debugging and tracing in .NET

1
Debugging and tracing in .NET

• Presented by
• Beeninder Dhanjal
• Department of Computer Science

2
What can be debugged?

• Windows Forms
• Web Forms
• Web services
• Stored Procedures

3
Debugging elements

• Project modes
• Breakpoints
• Command Window
• Call stack window
• Modules window
• Watch window
• Enterprise Debugging (Remote)
• Lightweight Debugger(DBGCRL.exe)

4
Conditional breakpoints

• Click the breakpoints window icon.
• Go to the breakpoints pane and right-click this
  breakpoint, and select Properties.
• On the File tab, click the condition button.
• In the breakpoint condition dialog, in the
  condition field, enter condition like
  sometextbox.Text 29 or you can reset the Hit
  Counter.

5
Debugging window

• Select the View Other Windows Command Window
  from the main menu.
• Example
• In the Command Window, enter for Example ?
  OrderID, and press Enter. This evaluates the
  value of OrderID.
• Can view data adapter values.
• Predefined commands

6
Enterprise Debugging Attaching to Processes

• Run the application through the URL
• In VS. Net select Tools, Debug Process.
• In the Processes dialog box, check Show System
  Processes if it is unchecked
• Select the aspnet_wp.exe (or w3wp.exe) process,
  and then click the Attach button which will open
  the Attach to Process window.
• Set break points and debug.

7
Stored Procedure Debugging

• Enable the SQL Debugging option by Right Clicking
  the Solution explorer properties Configuration
  option Debugging.
• Open Server Explorer, Browse to the database and
  Right click on the desired Store Procedure.
• Click Edit Stored Procedure.
• Place breakpoints and start Debugging.

8
Debugging Windows Forms

• Using Debug.Writeline()
• Using Trace
• Example
• -- Dim tfl As New
• TextWriterTraceListener("C\TraceLog.txt")
• -- Trace.Listeners.Add(tfl)
• -- Trace.WriteLine(Trace.Listeners.Count() "
  trace listeners")

9
Assersion

• Gives 3 options when the condition is met.
• Abort
• Retry
• Ignore
• Example
• Trace.Assert(Interestgt0)
• Shows the Complete Call Stack on Debugging.

10
TraceSwitch Class

• Open Application.config file
• Between the ltswitchesgt tags enter this line of
  XML
• ltadd name"mySwitch" value"2"gtlt/addgt
• Where
• 1 Only Error Messages
• 2 Error and Warning Messages
• 3 Informational, Warning and Error Messages.
• 4 Verbose, Informational, Warning, and Error
  messages.

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Application.Config

• lt?xml version"1.0" encoding"utf-8" ?gt
• ltconfigurationgt
• ltsystem.diagnosticsgt
• ltswitchesgt
• ltadd name"mySwitch" value"2"gtlt/addgt
• lt/switchesgt
• lt/system.diagnosticsgt
• lt/configurationgt

12
Tracing in ASP.NET

• Open the Web.Config file and replace
  Tracefalse to TraceTrue
• Run the application and replace the start page in
  the IE with trace.axd
• Example
• http//localhost/Homework3/trace.axd
• Can be done for individual files.

13
Tracing a Web Service

• 1. In Solution Explorer, right-click the web
  service .asmx, click View Code
• 2. uncomment Context.Trace.Write
• 3. From the main menu, select Debug Start
  without debugging
• 4. Start Microsoft Internet Explorer and enter
  http//localhost/HomeWork3/trace.axd to open the
  Request Details page.
• 5. Click View Details.

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Continued.

• 6. Scroll to Trace Information, double click
  WebService
• 7. Close Microsoft Internet Explorer.
• 8. In Solutions Explorer, double click web.config
  - ltauthorizationgt and change
• ltdeny users? /gt
• to
• ltallow usersnone /gt
• 9. From the main menu, select Debug Start
  without debugging

15

• Thank you!