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New C# programmers are sometimes intimidated by the quirky syntax of the language, which includes special characters such as semicolons (;), curly braces {}, and backward slashes (\). Fortunately, once you get accustomed to C#, these details will quickly melt into the background. In the following sections, you ll learn about four general principles you need to know about C# before you learn any other concepts.

Instead of having the listener class create the Podcast object, we ll create one via the page specification (see Listing 6-24). This creates a new instance of Podcast and binds it to an attribute called podcast. (Note: you could also use the ognl: prefix to create an instance of the Podcast class as well.)

app/models/ test/unit/ test/fixtures/ app/models/student.rb test/unit/student_test.rb test/fixtures/students.yml db/migrate db/migrate/001_create_students.rb

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Some languages are case-sensitive, while others are not. Java, C, C++, and C# are all examples of case-sensitive languages. VB is not. This difference can frustrate former VB programmers who don t realize that keywords, variables, and functions must be entered with the proper case. For example, if you try to create a conditional statement in C# by entering If instead of if, your code will not be recognized, and the compiler will flag it with an error when you try to build your application. C# also has a definite preference for lowercase words. Keywords such as if, for, foreach, while, typeof, and so on are always written in lowercase letters. When you define your own variables, it makes sense to follow the conventions used by other C# programmers and the .NET Framework class library. That means you should give private variables names that start with a lowercase letter and give public variables names that start with an initial capital letter. For example, you might name a private variable MyNumber in VB and myNumber in C#. Of course, you don t need to follow this style as long as you make sure you use the same capitalization consistently.

s Note If you re designing code that other developers might see (for example, you re creating components that you want to sell to other companies), coding standards are particularly important. The Visual Studio Help has information about coding standards, and you can also get an excellent summary of best practices in the IDesign C# Coding Standard white paper by Juval Lowy, which is available at www.idesign.net.

Comments are descriptive text that is ignored by the compiler. C# provides two basic types of comments. The first type is the single-line comment. In this case, the comment starts with two forward slashes and continues for the entire current line. Optionally, C# programmers can also use multiple-line comments using the /* and */ comment brackets. This trick is often used to quickly comment out an entire block of code. This way the code won t be executed, but it will still remain in your source code file if you need to refer to it or use it later: // A single-line C# comment. /* A multiline C# comment. */ C# also includes an XML-based commenting syntax that you can use to describe your code in a standardized way. With XML comments, you use special tags that indicate whether your comment applies to a class, method, parameter, and so on. Here s an example of a comment that provides a summary for an entire application: /// /// /// /// <summary> This application provides web pages for my e-commerce site. </summary>

You ll notice it creates a migration for you automatically. Fill that in as shown in Listing 12-10.

XML comments always start with three slashes. The benefit of XML-based comments is that automated tools (including Visual Studio) can extract the comments from your code and use them to build help references and other types of documentation. For more information about XML comments, you can refer to an excellent MSDN article at http://msdn.microsoft. com/msdnmag/issues/02/06/XMLC. And if you re new to XML syntax in general, you ll learn about it in detail in 19.

< xml version="1.0" encoding="UTF-8" > <!DOCTYPE page-specification PUBLIC "-//Apache Software Foundation//Tapestry Specification 4.0//EN" "http://jakarta.apache.org/tapestry/dtd/Tapestry_4_0.dtd"> <page-specification> <property name="podcast" persist="session" initial-value="new com.proajax.chapt6.Podcast()" /> </page-specification> At this point, we need to create the listener class mentioned before (see Listing 6-25). This class is really quite basic in this example. In the real world, your addPodcast method would actually do something (like persist the object in the database).

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