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Ideally, you should try to write exception-handling code so that every exception is handled within the application. But just in case an exception does bubble all the way up the call stack to the CLR, it would be better to show a friendly error page to your users than the default one provided by ASP .NET. For this purpose, ASP .NET provides two events that will be called when an exception is unhandled: The Page_Error event provides a way to trap errors occurring at the Page level. The Application_Error event provides a way to trap errors occurring within your code. The application-wide scope of this event also makes it an ideal place for adding logging code. If you provide handlers for both events, they both will be executed: first Page_Error and then Application_Error. But in some circumstances (depending on how your application is coded), it may be appropriate that errors handled in Page_Error don t get to Application_Error. In such cases, you can use the Server.ClearError method after handling the error in Page_Error, thus causing the last error to be cleared and avoiding the Application_Event call. Try It Out: Create a Custom Error Page In this example, you will use an ASP .NET error-handling feature to redirect to a friendly page in the situation when an exception goes unhandled. 1. Create a new web form and name it CustomError.aspx. Edit its code-behind file (CustomError.aspx.vb) to make the CustomError class inherit from FriendsBase instead of Page: Public Class CustomError Inherits FriendsBase 2. While you re still in CustomError.aspx.vb, add the following lines to the Page_Load() method: Private Sub Page_Load(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles MyBase.Load MyBase.HeaderMessage = "An error has been found!" MyBase.HeaderIconImageUrl = "~/Images/error.gif" End Sub

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All report elements can reference a report style to inherit all or part of the style properties. A report style declaration groups all the style-related properties supported throughout the library, but an individual element inherits only those style properties that apply to it. The others will be ignored. See 10 for details about applying styles to report elements.

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I ve already made this point several times in this book, but here it is just one last time. What the engine does at run time isn t necessarily what the optimizer thought about when costing. Here s a lovely example of an amazing run-time trick that the optimizer (currently) knows nothing about. The script is short_sort.sql in the online code suite: create table t1 as with generator as ( select --+ materialize rownum id, substr(dbms_random.string('U',6),1,6) sortcode from all_objects where rownum <= 5000 ) select /*+ ordered use_nl(v2) */ substr(v2.sortcode,1,4) || substr(v1.sortcode,1,2) sortcode from generator v1, generator v2 where rownum <= 1 * 1048576 ; -Collect statistics using dbms_stats here

vb.net data matrix reader

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3. Drag-and-drop the stylesheet used in your application onto the web form designer surface to link to it. 4. Switch to the HTML view of CustomError.aspx and add some friendly error message within the <form> element: <form id="CustomError" method="post" runat="server"> <p> <font size="5" color="red"> <img src="~/Images/sad.gif"> <b>An error has been found...</b> </font> </p> <p> We have detected an error in the Friends Reunion website. <br/> If this error persists, please contact our support team... </p> </form> 5. After creating the custom error page, you need to tell ASP .NET to show that error page instead of the default error page. To do this, edit the <customErrors> element of the Web.config file for the application like this: <configuration> <system.web> ... <customErrors defaultRedirect="CustomError.aspx" mode="On" /> ... </system.web> </configuration> 6. Now you need some code that explicitly throws an exception, so you can test that the custom error page works properly. To do this, edit LegalStuff.aspx.vb by adding this code to the Page_Load() method: Private Sub Page_Load(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles MyBase.Load Throw New NullReferenceException End Sub 7. Set LegalStuff.aspx as the start page and press Ctrl+F5. A new browser instance will open with the Login page for Friends Reunion. Log in, and you will be automatically redirected to LegalStuff.aspx. You should see the page shown in Figure 11-28.

select sortcode from t1 order by sortcode ;

How It Works When an exception is neither handled by the exception-handling code in the application nor cleared in the Page_Error() or Application_Error() event handlers, ASP.NET will check the <customErrors> element of the Web.config file to see whether a default error page has been specified for your application, through the defaultRedirect attribute. If it finds one, it will transfer execution to that page; if not, it will transfer execution to the default error page, which displays all the information about the unhandled exception. Note that you also changed the mode attribute from RemoteOnly to On, so that you can see the custom error page, even when executing on the local machine. With that new value, the custom page is always shown. If you wanted to still get the detailed, default error page showing the complete exception when running the application locally, you would leave the previous RemoteOnly value.

n 3, we mentioned that there are three entities that must be supplied as input to the report-filling process: the report template, the parameter values, and the data source of the report. Previous chapters have addressed the report templates. Now we are going to take a closer look at parameters and the report data source. These are the only sources of data that the reporting engine uses to fill the report. This data is organized according to the template defined in the report design to produce a ready-to-print, page-oriented document.

vb.net data matrix reader

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