The below code snippet's shows how to browse cells from DGN. There are two ways.

1. Browse all cells using Bentley.Interop.MicroStationDGN library

//Required References
using System;
using System.Collections.Generic;
using System.Diagnostics;
using Bentley.Interop.MicroStationDGN;

 public List<CellElement> BrowseAllCellsFromDgn()
        {

            List<CellElement> cellsList = new List<CellElement>();
            //Get all graphical elements cache from active model reference
            Bentley.Interop.MicroStationDGN.ElementCache elementCache = Bentley.MstnPlatformNET.InteropServices.Utilities.ComApp.ActiveModelReference.GraphicalElementCache;

            //Scan to get all elements  
            ElementEnumerator elementEnumerator = elementCache.Scan();
            try
            {
                while (elementEnumerator.MoveNext())
                {
                    //Get current element and check if it is of type cell
                    Bentley.Interop.MicroStationDGN.Element currentElement = elementEnumerator.Current;
                    if (currentElement.IsCellElement())
                    {
                        Bentley.Interop.MicroStationDGN.CellElement cellElement = (Bentley.Interop.MicroStationDGN.CellElement)currentElement;
                        string name = cellElement.Name;
                        cellsList.Add(cellElement);
                    }
                }
            }
            catch (Exception ex)
            {
                Trace.WriteLine(ex.Message);
            }
            return cellsList;
        }

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2. Using Bentley.DgnPlatformNET.Elements library

//Required References
using System;
using System.Collections.Generic;
using System.Diagnostics;
using Bentley.DgnPlatformNET;
using Bentley.MstnPlatformNET;
using Bentley.DgnPlatformNET.Elements;

 public List<CellHeaderElement> BrowseAllCellsFromDgn()
        { 
            List<CellHeaderElement> cells = new List<CellHeaderElement>();
            try
            {
                //Get active DGN
                DgnModelRef dgnModelRef = Session.Instance.GetActiveDgnModelRef();
                DgnFile dgnFile = dgnModelRef.GetDgnFile();

                //Get all models 
                ModelIndexCollection modelIndexCollection = dgnFile.GetModelIndexCollection();
                foreach (ModelIndex modelIndex in modelIndexCollection)
                {
                    DgnModel dgnModel = dgnFile.LoadRootModelById(out StatusInt status, modelIndex.Id);

                    //Iterate each model to get graphics element
                    ModelElementsCollection modelElementsCollection = dgnModel.GetGraphicElements();
                    foreach (Bentley.DgnPlatformNET.Elements.Element element in modelElementsCollection)
                    {
                        //Check for cell type elements
                        if (element.TypeName == "Cell")
                        {
                            CellHeaderElement cellHeaderElement = (CellHeaderElement)element;
                            cells.Add(cellHeaderElement);
                        }
                    }
                }
            }
            catch (Exception ex)
            {
                Trace.WriteLine(ex.Message);
            }
            return cells;
        }

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