Occurs when the media stream has been validated and opened, and the file headers have been read.
Assembly: System.Windows (in System.Windows.dll)
A MediaElement object generally has two types of properties:
Properties that are settable and that declare the appearance or behavior of the MediaElement.
Properties in this second category will not contain valid values until the MediaElement raises the event. The following is a list of MediaElement properties that will not be valid until after is raised by that element.
In addition, the Position property will be null before the event. However, Position is different from the other properties in the second group because it is settable. You should not attempt to set Position until is raised. You also should not set an initial Position value in XAML.
If the AutoPlay property is set to false, the media will be paused when the event occurs.
For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.