Design and Architecture

public class StudentCriteria
{
    public string Name { set; get; }
    public int? Age { set; get; }
    public DateTime? BeginRegisterDate { set; get; }
    public DateTime? EndRegisterDate { set; get; }

    public ValidationResult Validate ()
    {
        ValidationResult result = new ValidationResult();

        if (Age > 0)
                result.ErrorInfo.Add("Nope, too young.");

        // other checks, adding strings to ErrorInfo.

        return result;
    }
}
//Moveover, we should validate the input parameter StudentCriteria , so we call the following method in FindStudents(...)
//ValidationResult Validate(StudentCriteria sc);
//in which ValidationResult is an object representing the validation result, something like that:
public class ValidationResult
{
    public bool Success { get { return Convert.ToString(ErrorInfo).Length > 0; } }
    public List<String> ErrorInfo { set; get; }
}

codecs1 wrote:

All 'Error' information will be contained in ValidationResult and return to FindStudents

Bastard Programmer from Hell
"If you just follow the bacon Eddy, wherever it leads you, then you won't have to think about politics." -- Some Bell.

public static List<Student> FindStudents(StudentCriteria sc);

RobertSF wrote:

Would this be a case where a static class is appropriate?