Экспорт массива в Excel

var excelApp = new Excel.Application(); // Создание OLE-объекта.
excelApp.Visible = true;
string templateFile = Directory.GetCurrentDirectory() + @"\Документы\Прайс-лист.xls";
excelApp.Workbooks.Open(templateFil e, Type.Missing, Type.Missing,
Type.Missing, Type.Missing, Type.Missing,
Type.Missing, Type.Missing, Type.Missing,
Type.Missing, Type.Missing, Type.Missing,
Type.Missing, Type.Missing, Type.Missing);
Excel._Worksheet workSheet = excelApp.ActiveSheet;
 
workSheet.Cells[9, "A"] = "Код";
workSheet.Cells[9, "B"] = "Наименование товара";
workSheet.Cells[9, "C"] = "Срок гарантии";
workSheet.Cells[9, "D"] = "Цена(руб.)";
 
string s = "SELECT [Код], [Наименование], [Срок гарантии], [Цена (руб)] FROM Ассортимент";
OleDbDataAdapter dataAdapter = new OleDbDataAdapter(s, conMain);
DataTable dataTable = new DataTable();
dataAdapter.Fill(dataTable);
int RowsCount = dataTable.Rows.Count;
int ColumnsCount = dataTable.Columns.Count;
object[,] dataArray = new object[RowsCount, ColumnsCount];
for (int i = 0; i < RowsCount; i++)
for (int j = 0; j < ColumnsCount; j++)
dataArray[i, j] = dataTable.Rows[i][j];
 
excelappworkbooks = excelApp.Workbooks;
excelappworkbook = excelappworkbooks[1];
excelsheets = excelappworkbook.Worksheets;
excelworksheet = (Excel.Worksheet)excelsheets.get_It em(1);
excelcells = excelworksheet.get_Range("A11:D11", Type.Missing);
excelcells.Value2 = dataArray;
 
workSheet.Rows.AutoFit();

excelcells = excelworksheet.get_Range("A11:D" + RowsCount, Type.Missing);