This post shows how to export files (like CSV, Excel) to desktop in a GWT based webapp.

I was browsing through last month’s issue of .net magazine when I came across an article by Remy Sharp about HTML5. I must admit that I was a bit out of the loop with regards to this new version of HTML5 and where it was at, and the reality surprised me.

In my last blog post I have covered the new Silverlight 4 Webcam API and provided a demo that used my edge detection pixel shader to create a nice real time webcam effect. In this post I make an extended version available which can save webcam snapshots as JPEG files and I also discuss some limitations of the webcam API's built-in CaptureSource.AsyncCaptureImage snapshot method. Furthermore I will give some ideas on how to build a Silverlight 4 video chat / conference application on top of the provided JPEG capturing and encoding code.

I casually mentioned two tricks for sharing the same XAML across Silverlight and WPF in the notes of a post a couple weeks ago. I used both techniques in my DataVisualizationDemos project (which compiles for Silverlight and WPF from the same source code) and wanted to call them out for others in similar situations. The feedback I got was quite positive - until someone tried the subclassing trick with HierarchicalDataTemplate. While there's no reason that shouldn't work, it doesn't.

Accessibility is important to consider when designing applications. Not only do those with visual, physical, speech, cognitive, and neurological disabilities benefit from software that is accessible, but those without these disabilities benefit as well. Silverlight makes it possible to create applications that address accessibility needs, and some colleagues of mine and I decided to explore some of the possibilities by creating a control and navigation template theme that maps to Windows system colors (this will allow the application to seamlessly respond to Windows high contrast mode color changes).

Last week I posted about the great new materials on Channel 9’s site and on Silverlight.net for Silverlight 4. I had several people ask me about a downloadable version of my “What’s new in Silverlight 4” whitepaper that is posted on Channel 9’s site in HTML format.

Have you ever wanted to give the user the ability to drag a file from you desktop or file explorer onto your Silverlight application? Well, up until now you couldn’t. What’s that sound? It’s a bird… it’s a plane… no, it’s Silverlight 4 Beta. Yes, Silverlight 4 Beta is coming to the rescue and giving you the ability to have your Silverlight application act as a drop target. And it is so easy to do. Observe.

Before Silverlight 4 if you wanted to dynamically add ellipses (the commonly used … to show that the sentence continues), you have to invent your own implementation which usually involves creating your own control that wraps a text based control and then manipulate the text inside based on the size. Similar to what Robby Ingebretsen had to do here.

So, by now you should have heard that Silverlight 4 Beta was released at PDC 2009. One of the most interesting and fun features included in the release is the ability for you to access a users webcam and microphone. Even a fellow ElegantCoder wrote a short post on it. But I wanted to go into a little more detail. So I am going to show you have to access a list of webcams and microphones, capture video, and then take pictures and show them to the user. But, before I can show you how to use them, you have to have the Silverlight 4 Beta framework installed.

Visual WebGui brings the Win(dows) Over Web revolution which uses well known Visual Basic .NET (VB .NET) development paradigm for web and cloud.