Не могу загрузить данные с Excel

byte[] byteImageFromExcel = convertImageToByteArray(imageFromExcel);

            Microsoft.Office.Interop.Excel.Application importExcelToDataGridViewApplication = new Microsoft.Office.Interop.Excel.Application();
            Range ShtRange;
            try
            {
                OpenFileDialog importExcelToDataGridViewOpenFileDialog = new OpenFileDialog();
                //Supported File Extensions
                importExcelToDataGridViewOpenFileDialog.Filter = "Choose Excel File|*.xls;*.xlsx;*.xlsm";
                //Dialog Title
                importExcelToDataGridViewOpenFileDialog.Title = "Select Excel File";
                DialogResult importExcelToDataGridViewDialogResult = importExcelToDataGridViewOpenFileDialog.ShowDialog();
 
                if (importExcelToDataGridViewDialogResult == DialogResult.OK)
                {
                    Microsoft.Office.Interop.Excel.Workbook importExcelToDataGridViewWorkbook = importExcelToDataGridViewApplication.Workbooks.Open(importExcelToDataGridViewOpenFileDialog.FileName);
                    Microsoft.Office.Interop.Excel.Worksheet importExcelToDataGridViewWorksheet = importExcelToDataGridViewWorkbook.ActiveSheet;
                    ShtRange = importExcelToDataGridViewWorksheet.UsedRange;
                    //Looping Through excel Cells
                    for (int Rnum = 2; Rnum <= ShtRange.Rows.Count; Rnum++)
                    {
                        //Getting Image From excel path cells 
                        Image imageFromExcel = Image.FromFile(importExcelToDataGridViewWorksheet.Cells[Rnum, 8].Value);
                        //Converting Image To Byte Array
                        byte[] byteImageFromExcel = convertImageToByteArray(imageFromExcel);
                        //Populating DataGridView From Excel
                        dataGridView1.Rows.Add(importExcelToDataGridViewWorksheet.Cells[Rnum, 1].Value, importExcelToDataGridViewWorksheet.Cells[Rnum, 2].Value, importExcelToDataGridViewWorksheet.Cells[Rnum, 3].Value, importExcelToDataGridViewWorksheet.Cells[Rnum, 4].Value, importExcelToDataGridViewWorksheet.Cells[Rnum, 5].Value, importExcelToDataGridViewWorksheet.Cells[Rnum, 6].Value, importExcelToDataGridViewWorksheet.Cells[Rnum, 7].Value, importExcelToDataGridViewWorksheet.Cells[Rnum, 8].Value, byteImageFromExcel);
                        //for (int i = 0; i < ShtRange.Columns.Count ; i++)
                        //{
                        //    dataGridView1.Rows[Rnum].Cells[i].Value = importExcelToDataGridViewWorksheet.Cells[Rnum, i + 1].Value;
                        //}
                    }
                    //Release Resources
                    importExcelToDataGridViewWorkbook.Close();
                    importExcelToDataGridViewApplication.Quit();
                }
 
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message.ToString());
            }
            finally
            {
 
            }

        private byte[] convertImageToByteArray(Image imageFromExcel)
        {
            throw new NotImplementedException();
        }

private byte[] convertImageToByteArray(Image imageFromExcel)
{
    using (var ms = new MemoryStream())
    {
        imageFromExcel.Save(ms, imageFromExcel.RawFormat);
        return ms.ToArray();
    }
}