c# data matrix reader

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You might think that these bugs are bad. However, before you make that judgment, you should wonder about the value of having all the CLR/FCL exception types derived from SystemException and all your application exception types derived from ApplicationException. Once you start thinking about exception hierarchies, it doesn t take long before you realize that the sole benefit of a hierarchy is to allow code to catch a related set of exception types easily. In other words, it s easier to write code that catches an ArithmeticException than it is to catch all the exception types derived from it: DivideByZeroException, NotFiniteNumberException, and OverflowException. Now, would you ever want to catch all exceptions derived from SystemException versus all exceptions derived from ApplicationException I don t think so. On the other hand, there are times when you ll want to know if any exception is thrown, and you can gain this knowledge easily by catching System.Exception. So it does make sense that all exception types are derived from Exception; it also makes sense that DirectoryNotFoundException, EndOfStreamException, FileLoadException, and FileNotFoundException are derived from IOException. However, I don t think there is any value in having the SystemException and ApplicationException base types in the exception hierarchy. In fact, I think having them is just confusing. Also, I think that the two special exceptions, ExecutionEngineException and StackOverflowException, should be in a special hierarchy because they are unlike any other exceptions. Only the CLR itself never the application code should be able to throw one of these exceptions because an application can t recover gracefully from any of them.

Important When performing the arithmetic operation above, the first step requires that all operand values be expanded to 32-bit values (or 64-bit values if any operand requires more than 32 bits) . So b and 200 (values requiring less than 32 bits) are first converted to 32-bit values and then added together . The result is a 32-bit value (300 in decimal, or 12C in hexadecimal) that must be cast to a Byte before the result can be stored back in the variable b . C# doesn t perform this cast for you implicitly, which is why the Byte cast on the second line of the preceding code is required .

This generates the following output:

QFile file("some.dat"); file.open(QIODevice::WriteOnly); QDataStream out(&file); out << QString("Hello World"); out.close();

Custom Controls In some situations, a user control is too limiting. In these cases, custom layout or extensibility is more important than ease of creation. This is where custom controls are useful. In the Stock Trader RI, the pie chart control is a good example of this. This control is composed from data derived from the positions and shows a chart of the overall portfolio. This type of control is a little more challenging to create than a user control, and it has limited visual design support in Expression Blend and Visual Studio 2010, compared to a user control. Data Templates Data templates are an important part of most types of data-driven applications. The use of data templates for list-based controls is prevalent throughout the Stock Trader RI. In many cases, you can use a data template to create complete visual representations without needing to create any type of control. The ResearchRegion uses a data template to show articles and, in conjunction with an Items style, provides an indication of which item was selected. Expression Blend has full visual design support for data templates. Visual Studio 2010 only provides support for using the XAML editor to edit data templates. Resources Resources such as styles, resource dictionaries, and control templates can be scattered throughout an application. This is especially true with a composite application. When you consider where to place resources, pay special attention to dependencies between UI elements and the resources they need. The Stock Trader RI solution, shown in the following figure, contains labels that indicate the various areas where resources can live.

The simplest way to add a field in Office Access 2007 is simply to start typing in the last column. Double-click on the header and you can name the field. When you want to add field templates used in other tables or table templates, you can use the Field List task pane. The Field List task pane replaces the field picker and includes fields from other tables in your database. You simply drag and drop fields from the list to your table, and Office Access 2007 creates the relationships automatically. You ll find the command for this in the Create tab, in the Form Tools contextual tab in the Controls command set. Click Add Existing Fields to display the Field List (see Figure 9-11) and add the fields you want by dragging them to the table.