html editor using mshtml

Question

how to split cell using mshtml c# window application

mshtmlTable table1 = null;

            mshtmlTableRow row1 = null;

            mshtmlTableCell cell1 = null;

            GetTableElement(out table1, out row1, out cell1);

            HtmlElement table = getTableHTMLElement();

            if (table != null)

            {   int index = row1.rowIndex;

                int numberCols = row1.cells.length;

                HtmlElement selectedCell = table.GetElementsByTagName("tr")[row1.rowIndex].GetElementsByTagName("td")[cell1.cellIndex];

                HtmlElement nextcell = null;

                //if (cell1.cellIndex < table.GetElementsByTagName("tr")[row1.rowIndex].GetElementsByTagName("td").Count + 1)

                //{

               foreach (mshtml.HTMLTableRow elementRow in table1.rows)

                    {

                foreach (mshtml.HTMLTableCell elementCell in elementRow.cells)

                {

                    nextcell = (HtmlElement)row1.insertCell(cell1.cellIndex+1);

                    //mshtml.IHTMLElement c = (mshtml.IHTMLElement)row1.insertCell(cell1.cellIndex + 1);

                   

                   // c.innerHTML = " ";

                   

                    

                     }

                selectedCell.OuterHtml = nextcell.OuterHtml + selectedCell.OuterHtml;

               }