/// <summary>
/// Empties all expired entries that are in the StashRepo.
/// Throws an exception if any deletions fail and rolls back changes.
/// </summary>
public void EmptyAll()
{
int recordsDeleted = col.DeleteAll();
Console.WriteLine(@"{0} records deleted", recordsDeleted);
}
/// <summary>
/// Delete all documents inside collection.
/// Returns how many documents was deleted.
/// Run inside current transaction
/// </summary>
public Task <int> DeleteAllAsync()
{
return(Task.FromResult(cities.DeleteAll()));
}