Gets a value that indicates the relative progress of downloaded content. This property is relevant only if the SetSource method is used to set the image source.
A value between 0 and 1, inclusive, that represents the amount of total content that has been downloaded. Multiply by 100 to obtain a percentage.
This property is read-only. The default value is 0.
The DownloadProgressChanged event occurs when the DownloadProgress property value is increased by an amount of 0.05 or greater, or reaches 1.0.