How to update column between date

public string UpdateValid(DateTime startDate, DateTime endDate)
        {
          
            OleDbConnection conn = new OleDbConnection("my db path"));
            string status = null;
            
            string updateSql = "UPDATE Watchreceipt SET valid = false WHERE Dato BETWEEN @startDate AND @endDate AND DriverIDFK = @DriverIDFK";

            conn.Open();
            OleDbTransaction sqltrans = conn.BeginTransaction();
            OleDbCommand updateCmd = conn.CreateCommand();
            updateCmd.CommandText = updateSql;
            
            updateCmd.Parameters.AddWithValue("@startDate", startDate);
            updateCmd.Parameters.AddWithValue("@endDate", endDate);
            updateCmd.Parameters.AddWithValue("@DriverIDFK", UserMapper.driverNumber);

            updateCmd.Transaction = sqltrans;

            try
            {
                
                updateCmd.ExecuteNonQuery();
                sqltrans.Commit();
                
                status = "Ok";
            }
            catch (OleDbException odbe)
            {
                sqltrans.Rollback();
                System.Windows.Forms.MessageBox.Show("Rolled back\n" + odbe.Message);
            }
            catch (Exception ex)
            {
                System.Windows.Forms.MessageBox.Show("Systemfejl\n" + ex.Message);
            }
            finally
            {
                conn.Close();
            }

            return status;
        }