Delete level with elements

The below code snippet shows deleting the level with all the elements from current DGN using the same level.

public bool DeleteLevelWithElements()
        {
            //Set level name to delete
            string levelNameToDelete = "ASampleLevel";

            //Get Active Dgn Model
            //DgnModel model = Session.Instance.GetActiveDgnModel();
            DgnModelRef dgnModelRef = Session.Instance.GetActiveDgnModelRef();

            //Get all levels collection 
            FileLevelCache fileLevelCache = dgnModelRef.GetFileLevelCache();

            LevelHandle levelToDelete = fileLevelCache.GetLevelByName(levelNameToDelete);
            if (levelToDelete == null) return false;

            try
            {
                DgnFile dgnFile = dgnModelRef.GetDgnFile();
                //Get all models collection from DGN
                ModelIndexCollection modelIndexCollection = dgnFile.GetModelIndexCollection();

                foreach (ModelIndex modelIndex in modelIndexCollection)
                {
                    DgnModel dgnModel = dgnFile.LoadRootModelById(out StatusInt status, modelIndex.Id);
                    ModelElementsCollection modelElementsCollection = dgnModel.GetGraphicElements();
                    foreach (Element element in modelElementsCollection)
                    {
                        LevelId elementLevelID = element.LevelId;
                        //Compare element level Id and level to delete Id
                        if (levelToDelete.LevelId == elementLevelID)
                        {
                            if (!element.IsDeleted && !element.IsInvisible && element.IsGraphics && element.IsPersistent && element.IsValid)
                            {
                                try
                                {
                                    //Delete element from DGN
                                    element.DeleteFromModel();
                                }
                                catch (Exception ex)
                                {
                                    Trace.WriteLine(ex.Message);
                                }
                            }
                        }
                    }            
                }
            }
            catch (Exception ex)
            {
                Trace.WriteLine(ex.Message);          
            }

            //Delete Level
            LevelHandle next = null;
            if (LevelCacheErrorCode.None == fileLevelCache.RemoveLevel(next, levelToDelete))
                return true;
            else
                return false;        
        }