I was loading the table dynamically on button click, after one click table is loading , if I click 2nd I need to add (append) one more row with before

DyanmicTable indicates table name please help

if (DyanmicTable.Rows.Count == 0)
            {
           


                for (int r = 1; r < 3; r++)
                {
                    TableRow row = new TableRow();
                    row.BorderWidth = 1;
                    //add three cells
                    for (int j = 1; j < 4; j++)
                    {
                        TableCell cell = new TableCell();
                        cell.BorderWidth = 1;
                        cell.Text = String.Format("Row {0}, column {1}", r, j);
                        row.Cells.Add(cell);
                    }

                    DyanmicTable.Rows.Add(row);
                }

            }