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We’re releasing an analytics application in Silverlight to people inside the BBC. Today is release day, and we had some last-minute tweaks we wanted to roll out. Unfortunately, some of our customers were reporting a strange error when they tried this new version.

When someone asked me how to rotate the axis labels of a chart from the Data Visualization package of the Silverlight Toolkit/WPF Toolkit earlier today, I realized it was time for a quick blog post. Because when I've answered a question two or three times, it's usually a pretty good sign that I'll keep on answering it for some time. I usually try to head that kind of thing off at the pass, so here's my post on the topic for the benefit of future generations.

I am working on a Silverlight project, where we doing straight MVVM. Binding the Chart control included in the Silverlight Toolkit (www.codeplex.com/Silverlight) to a ViewModel is quite simple. But what when I want to bind a collection of different “graphs” each with an own collection of data-points to a single chart?

Also a new property ToolBarEnabled has been introduced in Chart. For more info, please check documentation for ToolBarEnabled property.

Create a “Silverlight Application” project. Download the latest Visifire binaries from here. Extract the Zip file and add reference for the file named “SLVisifire.Charts.dll”. In this sample, I am going to use WriteableBitmap class in order to extract the pixel wise color information of the chart rendered inside Silverlight content. We will take help of JpegEncoder provided by a third party library called FJ.Core to encode the raster information to file stream.

Chad Campbell has published a 7 minute video on the basics of creating drill-down charts with the Silverlight Toolkit.

Have you been trying to create drill-down charts with the Silverlight Toolkit? If so, I have created an approx. 7 minute video for internet.com which demonstrates the basics. The video can be seen here. The code I created for this video can be downloaded from here.

WPF is now an official platform for Charting! Today's release of the June 2009 WPF Toolkit includes the binaries for WPF Charting, the associated design-time assemblies for both Visual Studio 2008 and Blend 3, and the complete source code for everything (under the usual Ms-PL license).

I stumbled on to TwitterCounter.com recently and like any typical narcissistic geek, I put my username in there to see their stats on my account. One of the first things I noticed is the nice chart that shows a timeline of your followers counts. Being an ex financial consultant, I love charts. The next thing I noticed is that they have a very easy - to - use API that will return all this data in XML format, which makes is pretty easy to turn into objects that can be bound to Silverlight fields, and the series of chart data can be bound to a Silverlight chart.