Doors from rooms

[sonicer]

How can I get list of all doors from level 01(355) that are direction from rooms

In final I need for each room all doors that are from each room.

            IEnumerable<Element> doors = new FilteredElementCollector(doc).OfClass(typeof(FamilyInstance)).OfCategory(BuiltInCategory.OST_Doors).Where(e => e.LevelId.IntegerValue.Equals(355));

            IEnumerable<FamilyInstance> doors_to = from FamilyInstance f in doors where f.ToRoom.Name !=null select f;
            

foreach (FamilyInstance door in doors_to)

            {

                TaskDialog.Show("Door Name", door.Name + door.ToRoom.Name);

            }

[MarryTookMyCoffe]

you need to use:

Room roomfrom = door.FromRoom;
Room roomto  = door.ToRoom;

I suggest  for you to install Revit Lookup that Jerremy Tammik create:
https://boostyourbim.wordpress.com/2016/05/09/revit-lookup-2017-installer/