private void ProgressChanged(DownloadOperation download)
{
var item = Downloads.Single(d => d.DownloadOperation == download);
item.BytesReceived = download.Progress.BytesReceived;
item.TotalBytesToReceive = download.Progress.TotalBytesToReceive;
if (item.TotalBytesToReceive != 0)
{
item.ProgressRate = item.BytesReceived / item.TotalBytesToReceive;
}
}