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D. On the page that throws the error, set the debug attribute of the @ Page directive
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to false. You are deploying your application to a production environment. You want to redirect users to a default error page if they encounter any unhandled exceptions or HTTP errors within the site. You also want to indicate the user s requested resource on the error page to help with support calls. What actions should you take (Choose all that apply.)
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A. Set the redirect attribute of the error element to an error page within your site. B. Set the defaultRedirect attribute of the customErrors element to an error page
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within your site.
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c. Use the statusCode query string parameter to retrieve the requested resource to
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display on the error page.
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D. Use the aspxerrorpath query string parameter to retrieve the requested resource
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Lesson 1: Debugging Websites
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ChAPTER 8
You are investigating an error that only occurs when the application is deployed to the development or test server. You need to debug this error remotely. What actions should you take (Choose all that apply.)
A. Run the Remote Debugging Monitor (Msvsmon.exe) on the development computer
that is doing the debugging. Use the tool to define connection rights to the server you want to debug.
B. Run the Remote Debugging Monitor (Msvsmon.exe) on the server you want to debug.
Use the tool to define connection rights for the developer doing the debugging.
c. In Visual Studio, use the Attach To Process dialog box to attach to the ASP.NET
process on the server you want to debug.
D. In Visual Studio, use the Attach To Process dialog box to attach to the browser
process that is running the application you want to debug.
Lesson 2: Troubleshooting Websites
Not all issues can be found by using Visual Studio. Therefore, ASP.NET provides tools with which you can trace and monitor your code as it executes in a test or production environment. These facilities of ASP.NET can be used to troubleshoot and diagnose problems that might otherwise prove impossible to recreate. In addition, these features allow you to examine statistics and usage on your website. This lesson first covers enabling and configuring tracing in ASP.NET. It then explores how you can monitor a running website.
After this lesson, you will be able to:
Enable and configure ASP.NET tracing. Understand the data that is available through ASP.NET tracing. Work with monitoring tools to evaluate a running ASP.NET site.
Estimated lesson time: 20 minutes
Implementing Tracing
Tracing is the process of emitting data about a running application. In ASP.NET, this data is logged to a trace log file that you can access through a web browser. The data provides important information about your site, such as who accessed the site, what the results were, what the HTTP data looked like, and much more. You can also inject your own tracing calls into your code. This data will be emitted alongside the ASP.NET data. You enable tracing through the Web.config file. You can edit this file manually, or you can use the ASP.NET Web Site Administration Tool (WSAT) to provide an administrator-friendly interface to enable and configure tracing.
ChAPTER 8
Debugging and Deploying
Enabling Tracing by Using the WSAT
The following steps show how to enable and configure the trace facility by using the WSAT:
1. 2. 3.
Open the WSAT by selecting Website | ASP.NET Configuration from the Visual Studio menu. On the home page, click the Application tab of the WSAT. This will bring up settings for your application. On the Application tab, click Configure Debugging And Tracing (in the lower-right corner). This will display the configuration options for debugging and tracing, as shown in Figure 8-8.
FigURE 8-8 The debugging and tracing options in the WSAT.
Select the Capture Tracing Information check box. This enables the tracing features to be changed as necessary.
Lesson 2: Troubleshooting Websites
ChAPTER 8
As you can see from Figure 8-8, there are many options you can configure with respect to tracing. These options also map to Web.config settings (because that is what the WSAT administers). Table 8-2 describes each of the options, from the perspective of both the WSAT and Web.config.
TAbLE 8-2 ASP.NET Trace Settings
WsAT sETTing
WEb.COnFig sETTing
DEsCRiPTiOn
Capture Tracing Information Display Tracing Information On Individual Pages
enabled
Enables tracing for your application. When this is set to true, the other trace options are also made available. Displays the trace information directly on the webpage that is being traced. Depending on the page content, the trace information displays either at the bottom of the webpage or behind the regular webpage content. Designates whether you intend to display tracing just for local requests or for all requests. When set to Local Requests Only, the trace facility operates only with requests from the computer on which the web server is running. The All Requests setting enables tracing for all requests from any computer to the website. Enables sorting of the trace output either by time or by category. Sets the number of records to hold in the cache (or trace log). Designates whether to store the most recent trace result or the oldest trace results. When set to Most Recent Trace Results, the cache continues to update, holding only the latest results. When set to Oldest Trace Results, as soon as the number of requests has been met, the cache no longer updates until after the website is restarted or the log is cleared.
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