private string validate()
{
StringBuilder builder = new StringBuilder();
TextBoxValidator validator = new TextBoxValidator();
validator.append(builder, validator.checkValidLength(owner_name.Text.Trim(), 50, "Имя владельца"));
validator.append(builder, validator.checkValidLength(owner_surname.Text.Trim(), 50, "Фамилия владельца"));
validator.append(builder, validator.checkValidLength(owner_lastname.Text.Trim(), 50, "Отчество владельца"));
validator.append(builder, validator.PhoneNumberValidate(phone.Text.Trim()));
if (String.IsNullOrEmpty(builder.ToString()))
{
return(null);
}
return(builder.ToString());
}