ช่วยด้วยครับ insert excel เข้า sql server ทำไมถึงขึ้น column out of rang ครับ

                FileInfo excel = new FileInfo((@"D:\Application\Billpayment\FileTest\testbill.xlsx"));
                using (var package = new ExcelPackage(excel))
                {
                    var workbook = package.Workbook;

                    //*** Sheet 1
                    var worksheet = workbook.Worksheets.First();

                    string strConnString = "Server=xxxxxxxx;UID=sa;PASSWORD=xxxxx;database=base";
                    var objConn = new SqlConnection(strConnString);
                    objConn.Open();

                    //*** Loop to Insert
                    int totalRows = worksheet.Dimension.End.Row;
                    for (int i = 1; i <= totalRows; i++)
                    {
                        string strSQL = "INSERT INTO tbl_billpayment_confirm (ref_no_1,ref_no_2,billpayment_name,amount) "
                            + " VALUES  ("
                            + " '" + worksheet.Cells[i, 0].Text.ToString() + "', "
                            + " '" + worksheet.Cells[i, 1].Text.ToString() + "', "
                            + " '" + worksheet.Cells[i, 2].Text.ToString() + "', "
                            + " '" + worksheet.Cells[i, 3].Text.ToString() + "' "
                            + ")";
                        //MessageBox.Show(i.ToString());
                        var objCmd = new SqlCommand(strSQL, objConn);
                        objCmd.ExecuteNonQuery();
                        
                    }

                    objConn.Close();
                    MessageBox.Show("เสร็จ");
                }
            }
            catch (Exception ex)
            {
               MessageBox.Show(ex.Message);
            }