Attaching a Debugger in Visual Studio .NET

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In addition to attaching a debugger to an application when you start it, you can attach a debugger while an application is already running. To do so, complete the following steps: 1. Open the application in Visual Studio .NET. 2. Select Debug Processes to open the Processes dialog box. 3. Ensure that the "Show system processes" option is selected. 4. In the Available Processes pane, all the processes are listed. Scroll through the list to select aspnet_wp.exe. 5. Click Attach to open the Attach To Process dialog box. From the available choices, select Common Language Runtime and Script. 6. Click OK and then click Close. After you've attached the debugger to your running application, you can debug the application to trace the source of error. Note You can attach a debugger to a running Web page only if it is running in Internet Explorer. If you are viewing the page within the IDE, you will not be able to attach a debugger with your page. The ASP.NET Trace functionality In ASP.NET, the trace feature ensures that the programmers are able to log their applications by providing the means to monitor and examine program performance either during development or after deployment. ASP.NET allows tracing at two levels: Page-level tracing Application-level tracing Trace capability of ASP.NET is declared in the TraceContext class. To enable the Trace Page, the Trace directive must be set to True. The Trace property is exposed as a
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public property within ASP.NET pages. The Trace property refers to the TraceContext of the ASP.NET page. The TraceContext class is a noninheritable public class of the .NET Framework that is used for capturing the execution details of a Web request and presenting the data on the page. For developers to include messages for specific Trace categories, this class can be a good utility. You need to include the System.Web namespace in your Web project to be able to use this class. The class has certain properties and methods that provide the functionality for enabling the debugging of the ASP.NET pages. Table 7-2 and Table 7-3 list the properties and methods exposed by the TraceContext class. Table 7-2: Properties of the TraceContext class Property IsEnable Description Indicates whether tracing is enabled for the current Web request. Allows browsers to determine the state of tracing for the current Web request for the page or the application. You can use this property to check whether or not the page or application should include the tracing information before writing anything to the trace log. You can set this property for the page by including a trace="tr ue" attribute in the @ Page directive as the first element on
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Table 7-2: Properties of the TraceContext class Property Description the page. To set this property for the entire application, use the application's Web.config file. TraceMode Indicates the sequence in which the trace messages should be displayed to the requesting browser. The sequence of the trace messages can be sorted alphabeticall y or in the order in which they were processed by using user-defined categories.
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When the IsEnable property is set to True for the entire application, it is mandatory to exclusively set the property to False for any page that needs to be restricted from displaying the tracing information. Table 7-3: Public instance methods of the TraceContext class Method Equals Description Used to check whether or not the instance of an object equals the current object. Used for hashing algorithms and data
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Table 7-3: Public instance methods of the TraceContext class Method Description structure, such as a hash table. ToString Used to return a string that represents the current object. Used to return the type of the object passed. Used to write the trace information along with the optional exception data in the Trace log. The warnings that are written into the Trace log appear as red text. Used to write to the Trace log.
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