public int Insert(NewData newRecord) {
            if (newRecord.Name.Length < 3) {
                throw new ValidationException("The name must have at least 3 characters");
            }

            table.Rows.Add(new object[] { newRecord.Name, newRecord.Number, newRecord.Date });
            return 1;
        }
        public int Insert(NewData newRecord)
        {
            if (newRecord.Name.Length < 3)
            {
                throw new ValidationException("The name must have at least 3 characters");
            }

            table.Rows.Add(new object[] { newRecord.Name, newRecord.Number, newRecord.Date });
            return(1);
        }