C#

public class Student
{	public string a,b,c; public int id,x,y,z;}
public class CBuffer
{  	ArrayList[] buffArrayList = {null,null,null};
	int occupiedBufferCount;

	public ArrayList BufferSet
	{
	get
	{
		lock(this)
		{
		if (occupiedBufferCount == 0)
			Monitor.Wait(this);
		ArrayList readValue = buffArrayList[readLocation];
		--occupiedBufferCount;
		readLocation = (readLocation +1)%buffArrayList.Length;
		Monitor.PulseAll(this);
		return readValue; } }
	set
	{
		lock(this)
		{
		if(occupiedBufferCount == buffers.Length)
			Monitor.Wait(this);
		buffArrayList[writeLocation] = value;
		++occupiedBufferCount;
		writeLocation = (writeLocation + 1) % buffArrayList.Length;
		Monitor.PulseAll(this); } } } 

public class Consumer
{	private ArrayList ar;
	private CBuffer buff;
	Graphics g;
	public void Consumer(CBuffer _buff, Graphics _g)
	{ 	buff = _buff; g=_g; }
	public void TestDraw()
	{
		PaintBground();
		ar = new ArrayList();
		ar = buff.BufferSet;
		foreach (Student s in ar)
			DrawStudentLocationOnScreen(); }
	private void DrawStudentLocationOnScreen(){ ..codes..}  }

public class Producer
{	private ArrayList ar;
	private CBuffer buff;
	public void Producer(CBuffer _buff)
	{  buff=_buff;}
	public void Produce()
	{
		GetStudentsFromFile();
		ar.Add(student);
		buff.BufferSet = ar; }}