using System;
using System.Data;
using System.Configuration;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;

using System.Collections.Generic;   // using List

/// <summary>
/// Summary description for StudentData
/// </summary>
public class StudentData
{
    private static List<Student> _studentsList = new List<Student>();
    private static int id = 0;
    private int _searchId = 0;

	public StudentData()
	{
		//
		// TODO: Add constructor logic here
		//
        // Non Required
	}

    public List<Student> SelectStudents()
    {
        return _studentsList;
    }

    public void ClearStudents()
    {
        _studentsList.Clear();
    }

    public void InsertStudent(string name, int age, string course)
    {
        _studentsList.Add(new Student(id++, name, age, course));
    }

    private bool FindStudent(Student theStudent)
    {
        if (theStudent.Key == _searchId)
        {
            return true;
        }
        else
        {
            return false;
        }
    }

    public void UpdateStudent(int key, string name, int age, string course)
    {
        Student foundStudent;

        _searchId = key;
        foundStudent = _studentsList.Find(FindStudent);
        if (foundStudent != null)
        {
            foundStudent.Name = name;
            foundStudent.Age = age;
            foundStudent.Course = course;
        }
    }

    public void DeleteStudent(int key)
    {
        Student foundStudent;

        _searchId = key;
        foundStudent = _studentsList.Find(FindStudent);
        if (foundStudent != null)
        {
            _studentsList.Remove(foundStudent);
        }
    }

}