Get a head start with the new Windows Phone 7 developer tools. Learn how to create a Sokoban game in Silverlight for the WP7 platform.

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MVP Valentin Billotte has written a very interesting article about using JavaScript to call web services in Silverlight with the ability to block until call completion on the UI thread.

This part focusses on the Calcium integration of the Task Model.

This project is a Desktop and Silverlight user action management system, with undo, redo, and repeat. Allowing actions to be monitored, and grouped according to a context (such as a UI control), executed sequentially or in parallel, and even to be rolled back on failure.

A 'task' is the term I use to describe application work units,
instigated by the user or the system.

The main features of the task management system provided in this article are:

• Tasks can be undone, redone, and repeated.
• Task execution may be cancelled.
• Composite tasks allow sequential and parallel execution of tasks with automatic rollback on failure of an individual task.
• Tasks can be associated with a context, such as a UserControl, so that the undo, redo, and repeat actions can be, for example, enabled according to UI focus.
• Tasks can be global, having no context association.
• The task system can be wired to ICommands.
• Tasks can be chained, in that one task can use the Task Service to perform another.
• Return to a point in history by specifying an undo point.
• Coherency in the system is preserved by disallowing the execution of tasks outside of the Task Service.
• Task Model compatible with both the Silverlight and Desktop CLRs

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Calcium SDK development news can now be found in 140 characters or less.