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The future of user interface is probably an entirely different approach to programmatic control creation. This approach, first popularized with the Web, is markup based. Rather than writing code to programmatically create and insert controls into a container, with markup-based user interface you write a template (typically in an XML-based format) that defines each control. The user interface framework parses this file and then creates the corresponding controls (typically one for each tag it finds). One of the goals of markup-based user interface language is to allow a proper separation between user interface code (the event handlers) and the user interface itself (the graphical widgets). In an ideal world, this separation would let professional graphic designers perfect the user interface look and feel without compromising the security or integrity of your code. Of course, it s also a great way to create flexible, extensible user interfaces. For example, you could build a tool for filling out forms (like the one shown earlier in this chapter) much more easily. Instead of writing the logic to interpret your own custom XML format, you could simply create a template for each form using a markup-based language like XAML or WFML.

WPF is a library that offers a completely new programming model for user interfaces. It is aimed at creating desktop applications that have more pizzazz than the ones that are created with WinForms. WPF also comes with a new XML-based language called XAML, which you can use to code the bulk of this form s layout, leaving you free to use F# to code the interesting parts of your application.

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You have seen how to back up your home computers, but what about backing up the data in the shared folders on your Windows Home Server At the time of writing, no backup solutions are available for Windows Home Server, but this is likely to change. You can check the current situation by doing a search on the Internet or checking the Windows Home Server web site (http://www.microsoft.com/windows/ products/winfamily/windowshomeserver/default.mspx). In the meantime, the best suggestion is to attach an external hard drive to one of your home computers, and then manually copy the contents of the shared folders to that drive. You should repeat this process on a regular basis.

Note The idea of markup-based user interface is similar to the dynamic form generator shown in this chapter. There are two key differences. First, in the form generator you need to write the parsing, whereas XAML and WFML provide their own parsers that automate this low-level grunt work. The second difference is that the form generator uses a higher-level model that has elements map to logical survey elements. In the XAML and WFML standards, elements map directly to controls.

A significant example of markup-based user interface is XAML (Extensible Application Markup Language, but pronounced Zamel ). XAML is an XML-based markup language for defining user interfaces that was created by Microsoft, and is the planned standard for the Avalon display technology in Windows Vista, Microsoft s next version of Windows. Although Windows Vista isn t likely to materialize anytime soon (2006 is a realistic estimate), you can start using XAML in .NET applications if you want to experiment with third-party products like Xamlon (see www.xamlon.com). You can start experimenting with Avalon through a downloadable tech preview or beta see http://msdn.microsoft.com/windowsvista/experience for more information. Using XAML, you can define your windows with tags and write the logic behind it using your favorite .NET language, giving you the ability to tweak either piece separately. Of course, you might not want to delve into the emerging XAML standard yet, because using a third-party product like XAML adds complexity and overhead to today s Windows Forms applications. If you re still interested in markup-based user interface, you might want to explore a lighter-weight option called WFML.

WFML (Windows Forms Markup Language) provides a more straightforward model for using markup with Windows Forms applications. Essentially, WFML consists of two pieces: the WFML markup standard (which dictates how you can build templates) and the WFML parser (which reads templates and creates the corresponding control objects).

Note Several XAML designers now exist; these designers allow F# users to design their interface using a graphical WYSWIG tool and then add interactivity to it using F#. For example, Mobiform offers a designer called Aurora (www.mobiform.com/products/aurora/aurora.htm), and Microsoft offers a designer called Expression Blend (www.microsoft.com/expression/products/overview.aspx key=blend).

Summary

Note If you ve programmed with ASP.NET before, the idea of WFML will seem surprisingly familiar. Like WFML, ASP.NET uses a parser to process a template (in this case, the .aspx file) and generate web page controls before your code executes.

WFML is described in detail on the Microsoft Windows Forms community site at http://windowsforms.net/articles/wfml.aspx. WFML isn t a standard it s really a proofof-concept demonstration of markup-based language, and it won t ever be incorporated into the .NET Framework. However, it s still usable in current Windows Forms applications.

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