Using the Windows 7 shell Taskbar Item to show that a WPF application is busy/idle

Add the following to the Main window XAML:

    <Window.TaskbarItemInfo>
        <TaskbarItemInfo />
    </Window.TaskbarItemInfo>

In code: To make the task bar icon pulse green to show that it is busy but when the application cannot determine how far through the proceesing the app is:

this.TaskbarItemInfo.ProgressState = TaskbarItemProgressState.Indeterminate;

To stop the task bar icon pulsating green/return it to normal:

this.TaskbarItemInfo.ProgressState = TaskbarItemProgressState.None;

To show progress through the task bar icon:

this.TaskbarItemInfo.ProgressState = TaskbarItemProgressState.Normal;
// ProgressValue must be a value between 0.0 and 1.0
this.TaskbarItemInfo.ProgressValue = progressPercentage/100.0d;