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New Debugging Features in Visual Studio 2010
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This book assumes that you have some familiarity with the Visual Studio development environment and does not explain the details of setting breakpoints and monitoring values. It is assumed that you know that you can set a breakpoint to pause a running webpage at a specific line and then examine the values of different variables. In Visual Studio 2010, you can export and import a set of breakpoints by using the Debug window. First, display the window by clicking the Debug menu, selecting Windows, and then selecting Breakpoints. On the Breakpoints toolbar, click the Export button to save the current set of breakpoints to a file. Later, use the Import button to read them back in. This allows you to quickly set up debugging for a recurring problem. While debugging, you can point to a variable to view its current value in a DataTip. With Visual Studio 2010, you can click the pushpin icon on the DataTip, as shown in Figure 8-2. The value will then always appear in the debugger, and you can add comments that you can view later. After you stop debugging, Visual Studio displays a pushpin icon in the left margin. Point to the pushpin to view the DataTip s value from the last debugging session. You can import and export pinned DataTips by using the Debug menu.
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Lesson 1: Debugging Websites
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ChAPTER 8
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FigURE 8-2 Pinning a value in Visual Studio 2010.
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There are many other useful debugging improvements. For detailed information, see VS 2010 Debugger Improvements at http://weblogs.asp.net/scottgu/archive/2010/04/21 /vs-2010-debugger-improvements-breakpoints-datatips-import-export.aspx.
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Defining Custom Error Pages
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In your production environment, it is likely that you do not want to show users the default ASP.NET error page if your site breaks. This holds true for the default Internet Information Services (IIS) error pages as well. Rather, you most likely want users to see a page that tells them how to contact support to resolve the problem. You can also configure your site to display a generic error page if users encounter an unhandled error. You can set this page at the site level. You can also set individual pages for specific error types.
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Configuring a Custom Site-Level Error Page
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You configure custom errors inside the Web.config file by using the <customErrors> element nested inside <system.web>. This element has the mode and defaultRedirect attributes. The mode attribute can be set to on to turn custom errors on, off to turn them off, or RemoteOnly to turn custom errors on for remote clients only. With RemoteOnly, if the user (typically an administrator) is on the server, he or she will not get the custom error, but instead will get the real error message. The defaultRedirect attribute is used to indicate the path to a default error page. This page will be displayed when an unhandled exception occurs on the site. The only time this will not happen is when a specific custom error page is added to the <error> child elements of <customErrors> (as discussed in the next section). The following example shows markup for a custom error definition inside Web.config.
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<configuration> <system.web> <customErrors defaultRedirect="SiteErrorPage.aspx" mode="RemoteOnly"> </customErrors> <system.web> </configuration>
Notice that in this markup, the page is set to an ASPX page. You can set this to an HTM page, an ASPX page, or another resource to which the web server can redirect.
ChAPTER 8
Debugging and Deploying
On redirection, the server passes the path of the page that caused the error. This path is provided as part of the query string by using the named parameter aspxErrorPath; you can use this information to track errors on your site. For example, the following shows the browser s URL when the SiteErrorPage.aspx page is displayed based on an error thrown on Default.aspx:
http://localhost/examples/SiteErrorPage.aspx aspxerrorpath=/examples/Default.aspx
Configuring Error-Specific Error Pages
It is also possible to define specific pages for various HTTP status codes. This allows you to provide more specific information to users when a configured status code is returned. For example, if users do not have access to a requested page or resource, their request results in an HTTP 403 return code. This status code indicates that they are denied access to the resource. You can then write a custom page that explains the process for requesting access to the page. Use the <error> element to redirect to that custom page. The following markup shows an example.
<configuration> <system.web> <customErrors defaultRedirect="SiteErrorPage.aspx" mode="RemoteOnly"> <error statusCode="403" redirect="RestrictedAccess.aspx" /> </customErrors> <system.web> </configuration>
There are many HTTP status codes. Errors fall in the range from 400 to 600. Codes with numbers 400 to 499 are reserved for request errors and codes 500 to 599 are set aside for server errors. Table 8-1 lists some common HTTP status codes for errors. For a complete list, see http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.
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