Try It Out: Altering a Table for a Default Value in Query Editor in C#

Integrating DataMatrix in C# Try It Out: Altering a Table for a Default Value in Query Editor

FlexUnit4TheorySuite ); } ]]> </fx:Script> <flexUnitUIRunner:TestRunnerBase id="testRunner" width="100%" height="100%" /> </s:Application>

<TextBox Text="" Grid.Row="1" Grid.Column="1" FontFamily="Verdana" FontSize="14" FontWeight="Bold" Foreground="#FF0008FF" Background="#FFF9F57D" VerticalAlignment="Top" Margin="5,5,5,5"/> <TextBox Text="" Grid.Row="2" Grid.Column="1" FontFamily="Verdana" FontSize="14" FontWeight="Bold" Foreground="#FF0008FF" Background="#FFF9F57D" VerticalAlignment="Top" Margin="5,5,5,5"/> <StackPanel Grid.Row="3" Grid.Column="1" Orientation="Horizontal"> <Button Content="Save" Margin="5,5,5,5" Width="75" FontFamily="Verdana"/> <Button Content="Next" Margin="5,5,5,5" Width="75" FontFamily="Verdana"/> <Button Content="Delete" Margin="5,5,5,5" Width="75" FontFamily="Verdana"/> </StackPanel> </Grid> 14. Your application will appear something like what is shown in Figure 12-12. When you run the application, it should look very similar to the application at the end of the previous exercise (Figure 12-6).

The code-behind is a standard C# class, but there are some new attributes on the code that WCF uses to determine contracts and binding. The basic service created by the IDE will look like this:

Based on a publish/subscribe architecture, the Exception Handler pattern can be used to buffer calls to components that may throw exceptions from the actual business flow of a process. The Exception Handler buffer allows for a common mechanism to catch, process, and retry exceptions (including notification to an administrator) that can be reused across multiple solutions. Figure 5 53 shows the high-level architecture of a request, and Figure 5 54 shows the high-level architecture of a response. The orchestrations are built in such a way that the business workflow is separate from the actual calls to external tasks. The only orchestration that references anything besides ports that are directly bound to the MessageBox are the Task Processing orchestrations. So, too, these orchestrations are the only ones that will throw exceptions that need to be handled in a common way. Any time an exception is thrown for any reason (such as a call to an external assembly throws an error, a web service is down, a database cannot be connected to, and so on), the Task Processing orchestration will catch the error, wrap the error information in a message, and return the message back to the Exception Handler orchestration. The Exception Handler orchestration will then decide whether to retry the call to the task (for system exceptions) for example, if a database cannot be connected to, the orchestration will delay for a specified period of time and then retry or simply notify an administrator and wait for a response. The response back from an administrator could indicate that the call to the task should be retried or that the entire process should be cancelled. The Exception Handler pattern can be used in a variety of scenarios, with the following benefits: It offers configurable automatic retries of system exceptions. An administrator is notified (via any type of BTS adapter) for business rule exceptions and after a maximum number of automatic retries of system exceptions. It allows multiple unrelated orchestrations to publish to a single version of the Exception Handler orchestration. There are no uncaught or unhandled exceptions. No messages end up suspended. It offers complete visibility into the life cycle of an orchestration.

In 2001, Microsoft released Microsoft .NET, which represents a paradigm shift in the way web applications are built. For the purposes of this book, you only need to know that .NET is a platform that provides the framework for ASP.NET, which provides a simple development model for building highly interactive web applications. Although you can build static websites using ASP.NET, its real power comes from its ability to manage user interactions from the web page all the way back to a data store without the need to know client-side scripting. With ASP.NET, a lot of the heavy lifting occurs on the server, thus reducing the amount of client-side scripting a programmer needs to know. However, ASP.NET still supports all client-side scripting, so those of you who are more familiar with it can definitely leverage it where appropriate. When users interact with an ASP.NET web page, they send a processing request to the server, where it is executed and returned back to them. One of the beautiful things about ASP.NET is that you do not need to know much more than what you ve just read to get it up and running. However,