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or those who have worked with Silverlight 1.0, one of the first observations you most likely made was the lack of common controls such as the Button, TextBox, and ListBox. In fact, Silverlight 1.0 provided only two basic controls: Rectangle and TextBlock. From these, the developers were expected to implement all of the rich controls they needed. As you can imagine, it was quite a bit of work to create all of the form controls using just these two base controls. Since then, Microsoft s vision of Silverlight has gone beyond basic animations to spark up your applications and into the realm of feature-rich user interfaces (UIs). To this end, Silverlight 2 includes a strong base of controls that you can use within your Silverlight applications. In this chapter, we will first look at the Silverlight controls in general by examining control properties and events. We will then take a brief tour of some of the more common form controls included in Silverlight 2. This chapter is meant to provide a high-level introduction to these common Silverlight controls. We will continue to work with the controls throughout the remainder of the book, so you will see more specific usage scenarios.

note ActiveRecord is not the only library to offer features that relate objects to database tables. Og,

DataMapper (http://datamapper.org/), and Lafcadio (http://lafcadio.rubyforge.org/) are three alternatives, though they re far less popular than ActiveRecord. DataMapper is notably used in some alternative web frameworks and should also be supported for direct use in Rails 3.0 (not released at the time of writing).

Summary

The most straightforward and simple way to set a property is by using attribute syntax. However, in some cases, you will use element syntax.

In this chapter, we ve looked at how data can flow into and out of your Ruby programs. Initially, we looked at the low-level concept of I/O streams before quickly moving on to the pragmatism of databases. Databases provide a way to work with data in a more abstracted fashion without worrying about the underlying structure of the data on the computer s filesystem. Indeed, databases can be located within memory or on totally different machines, and our code could remain the same.

Figure 7-48. Preparing to search on QC user names 6. Select each of the three user names, as shown in Figure 7-49, so that the green check mark appears to the left of the user name, then click the OK button.

Let s reflect on the main concepts covered in this chapter: I/O: Input/output The concept of receiving input and sending output by various means on a computer, often via I/O streams I/O stream: A channel along which data can be sent and/or received Standard input (stdin): A stream that relates to the default way of accepting data into the application, usually the keyboard Standard output (stdout): A stream that relates to the default way of outputting data from the application, usually to the screen File pointer: An abstract reference to the current location within a file Database: An organized collection of data structured in a way that makes it easy to be accessed programmatically CSV (comma-separated values): A way of structuring data with attributes separated with commas CSV can be stored in plain text files.

Marshalling: The process of converting a live data structure or object into a flat set of data that can be stored on disk, sent across a network, and then used to reconstruct the original data structure or object elsewhere or at some other time Table: A collection of data organized into rows, with multiple columns, where each column represents a different attribute of each row There are usually multiple tables within a database, containing different types of data SQLite: An open source, public-domain relational database API and library that works on a single-user basis on a local machine It supports SQL as its querying language MySQL: An open source relational database system available in both community and professional editions It is maintained by MySQL AB Web hosting companies commonly offer MySQL database support.

Most properties that can be represented as a simple string can be set using attribute syntax. Setting an attribute in XAML is just like setting an attribute in XML. An XML element contains a node and attributes. Silverlight controls are defined in the same way, where the control name is the node, and the properties are defined as attributes.