Using Progress

using (var progress = new Progress(title: l.Translate("Versandvorschläge werden erstellt..."), count: docs.Count(), ticks: 100, canAbort:true ))
{
    foreach (var docRow in docs)
    {
        progress.Increment();

        CalculateClientTransitTime(docRow);

        AddRowToProposal(docRow);
    }
}