c# code to generate barcode Debugging and Deploying in C#.NET

Creation Denso QR Bar Code in C#.NET Debugging and Deploying

ChAPTER 8
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Debugging and Deploying
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a debugging console (as the Apple Safari and Opera browsers do), that console can also be used to view the trace messages. Figure 8-11 shows the result of the preceding markup as displayed to the Visual Studio Output window (at the bottom of the screen).
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FigURE 8-11 The Sys.Debug.trace message in the Output window.
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Quick Check
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1 . How can you make trace data display on your webpage 2. What is the name of the virtual page that you can request to view trace data
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when the trace data is not displayed on its corresponding webpage
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Creating Bar Code In Visual Studio .NET
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Quick Check Answers
Drawing EAN / UCC - 13 In Objective-C
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Encoding Data Matrix 2d Barcode In None
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1 . Set Trace="true". 2. The virtual page is called Trace.axd.
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Lesson 2: Troubleshooting Websites
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ChAPTER 8
Monitoring a Running Web Application
Tracing provides diagnostic information about a page. This can be very useful for troubleshooting problems with pages in a test environment. However, you often need information about the overall health of your application. You should be able to monitor the application and be notified of various events such as error conditions, security issues, and request failures. You can do so by using the features of ASP.NET health monitoring. ASP.NET health monitoring provides a set of classes in the System.Web.Management namespace for tracking the health of your application. You can use these classes to create your own events and your own custom event listeners (and viewers). You can also use the default features exposed by these classes to monitor most aspects of any running website. This section focuses on the latter option.
The Health Monitoring Classes
The health monitoring system works by raising and logging ASP.NET events based on your configuration. You enable these events based on what you want to monitor with respect to your application s performance and health. The monitoring occurs in a deployed environment. You can use the features of health monitoring to receive email messages about important activities, log information to the event log, and log information to SQL Server. The first step in health monitoring is to determine which events to listen for. These events are defined as classes. The classes are based on a class hierarchy that defines the data that is logged with the event. For example, a web health monitoring event class might contain information about the process that is executing your code, the HTTP request, the HTTP response, and error conditions. You can also use the base web event classes in the System.Web.Management namespace to write your own web events for health monitoring purposes. Table 8-4 lists the key web event classes and their basic use.
TAbLE 8-4 The Web Event Classes in ASP.NET
CLAss nAmE
DEsCRiPTiOn
WebBaseEvent WebManagementEvent WebHeartbeatEvent WebRequestEvent WebApplicationLifetimeEvent WebBaseErrorEvent WebErrorEvent
The base class for creating your own web events The base class for creating web events that contain application process information Serves as a periodic event that raises information about your application at set intervals The base class that contains web request information Raised when a significant application event occurs, such as application start or shutdown The base class for creating error-based events Used to provide information about an error when it occurs in your application
ChAPTER 8
Debugging and Deploying
CLAss nAmE
DEsCRiPTiOn
WebRequestErrorEvent WebAuditEvent WebSuccessAuditEvent WebAuthenticationSuccessAuditEvent WebFailureAuditEvent WebAuthenticationFailureAuditEvent WebViewStateFailureAuditEvent
Contains request data for request errors The base class for creating audit (security) events Raised when a successful security operation occurs for your application Used to provide information when a successful user authentication occurs on the site Raised when a failed security operation occurs Used to provide information when a failed attempt at user authentication occurs on the site Raised when the view state fails to load (typically as a result of tampering)
When you know which events to listen for, the second step is to enable a listener (or log). The ASP.NET health monitoring system defines a set of providers (or listeners) that are used to collect the web event information. These listeners consume the web health events and typically log the event details. You can use the default listeners or write your own by extending the existing WebEventProvider class. The default providers include EventLogWebEventProvider, WmiWebEventProvider, and SqlWebEventProvider. You configure web events and web providers in ASP.NET configuration files, which are discussed next.
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