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Data export from DataGrid to Excel is very common task, and it can be solved with different ways, and chosen way depend on kind of app which you are design. If you are developing app for enterprise, and it will be installed on several computes, then you can to advance a claim (system requirements) with which your app will be work for client. Or customer will advance system requirements on which your app should work. In this case you can use COM for export (use infrastructure of Excel or OpenOffice). This approach will give you much more flexibility and give you possibility to use all features of Excel app.

Josh uses multi-touch to navigate through a really clever way of presenting material. I'd try and describe it, but it's really best if you watch it. 

Take advantage of a host of new platform and tools capabilities to produce better user experiences, with less code.

Let’s say you want to create a standardized “gadget” for your application, from which anyone can derive and create their own gadgets.

The desire:

• Provide a base gadget that has some sort of standardized chrome and some behavior to be inherited by all derived controls.

Scott Guthrie has started a series of blog posts on the upcoming VS 2010 and .NET 4 release and in this one he discusses all the improvements in WPF 4.

WPF (Windows Presentation Foundation) is one of the core components of the .NET Framework, and enables developers to build rich, differentiated Windows client applications.  WPF 4 includes major productivity, performance and capability improvements – in particular in the areas of Controls, XAML, Text, Graphics, Windows 7 integration (multitouch, taskbar integration, etc), Core Fundamentals, and Deployment.  This is the first of several posts I’ll do over the coming months about some of the improvements and new features.