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If you re a seasoned ASP.NET developer, you re most interested in what s new in Visual Studio 2005. Although most of the editing features and debugging tools in Visual Studio 2005 are the same as those in Visual Studio 2003, the underlying model has a few significant changes. Here are the four most significant changes, all of which you ll learn more about in this chapter: Projectless development: Visual Studio no longer clutters your web projects with extra development files (such as .csproj and .sln). One obvious benefit of this model is that you can deploy exactly what you develop, without needing to filter out just a subset of the files. However, as you ll see in this chapter, the concept of projectless development is slightly overstated. Visual Studio still stores some information in a solution file (such as breakpoints and build settings), and it quietly stows that file away under a user-specific directory. However, there s a significant difference these hidden solution files aren t required. Essential details (such as project references) are stored right in the web.config file. You ll learn about projectless development in the Websites in Visual Studio section of this chapter.

In this chapter, you saw how a bit of carefully chosen JavaScript code can extend your ASP.NET web pages with more responsive interfaces and more dynamic effects. Along the way, you saw how to develop .NET solutions for some traditional HTML and JavaScript techniques, such as page processors, pop-up windows, rollover buttons, and frames. You also explored the new client callback feature that helps you implement seamless page updates. You can do a lot more by creatively applying a little JavaScript. For more ideas, check out some of the custom controls available at Microsoft s http://www.asp.net community website.

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The first step is to design the communication contract. Because your WebPart will provide just simple text and date information, the communication contract is fairly simple: Namespace Apress.WebParts.Samples Public Interface INotesContract Property Notes() As String ReadOnly Property SubmittedDate() As DateTime End Interface End Namespace This contract defines two properties: one for retrieving and updating the notes text for a customer and the second for retrieving the date of a submitted entry. Now the provider has to implement this interface, while the consumer has just to know about the interface.

New compilation model: Visual Studio is no longer responsible for compiling your code. Instead, ASP.NET takes on that responsibility exclusively. This gives Visual Studio more flexible debugging, and it simplifies deployment on different platforms (for example, 32-bit and 64-bit Windows). It also allows you to combine web pages written in C# with web pages written in another .NET language (such as Visual Basic) in the same project. New code model: The shift in the compilation model also reduces the differences between the code-behind model and the code-inline model of writing web pages, both of which Visual Studio now supports. However, the syntax for code-behind is subtly different from that used for Visual Studio 2003 web pages, and you ll need to perform a one-way conversion operation to edit your web application in Visual Studio 2005. You ll learn about the code model in section The Code Model later in this chapter. Integrated test web server: If you ve programmed with Web Matrix (a scaled-down design tool used with ASP.NET 1.x), you ll recognize the new integrated web server, which allows you to run your web pages without setting up virtual directories or deploying your website. Along with these changes, a new edition of Visual Studio, called Visual Studio 2005 Team System, adds advanced collaboration and code versioning support (which is far beyond that available in simpler tools such as Visual SourceSafe). Although Visual Studio Team System isn t discussed in this chapter, you can learn more from http://lab.msdn.microsoft.com/teamsystem or Pro Visual Studio 2005 Team System (Apress, 2005). Another interesting new tool is the freely downloadable ASP.NET Development Helper, which gives you the ability to see view state, tracing, and caching information in your web browser. You ll learn about the ASP.NET Development Helper in the ASP.NET Development Helper section.

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