Revit API Delete Detail Elements

DeleteDetailElements.cs

public void DeleteDetailElements()
{
	Document doc = this.Application.ActiveUIDocument.Document;
	
	FilteredElementCollector detailLines = new FilteredElementCollector(doc).WhereElementIsNotElementType().OfCategory(BuiltInCategory.OST_Lines);
	IList<ElementId> detailLineIds = new List<ElementId>();	
	foreach(CurveElement dl in detailLines)
	{
		detailLineIds.Add(dl.Id);
	}
	
	FilteredElementCollector filledRegions = new FilteredElementCollector(doc).OfClass(typeof(FilledRegion));			
	IList<ElementId> filledRegionIds = new List<ElementId>();
	foreach(FilledRegion fr in filledRegions)
	{
	  detailRegionIds.Add(fr.Id);
	}
			
	using(Transaction t = new Transaction(doc,"Delete Detail Elements"))
	{
		t.Start();
    
		doc.Delete(detailLineIds);
		doc.Delete(filledRegionIds);
    
		t.Commit();
	}
}