private void SendDocumentForPrint()
{
var selectedDocumentClone = (PrintableDocument)SelectedDocument.Clone();
_documentsInPrintList.Add(selectedDocumentClone);
ChangeDocumentStatus(selectedDocumentClone, WAITING_FOR_PRINT);
if (_printingThread == null)
{
_printingThread = new Thread(new ThreadStart(() => Printing()));
_printingThread.Start();
}
else if (!_printingThread.IsAlive)
{
_printingThread = new Thread(new ThreadStart(() => Printing()));
_printingThread.Start();
}
}
