C#调用其他线程的控键做为控键的父控键

using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;
using System.Windows.Forms;
using System.Threading;
namespace WindowsApplication1
{
    class Class1
    {
        private Panel l;
        Label la;
        public Class1(Panel a)
        {
            this.l = a;
        }

        public void add()
        {
                int x = 0, y = 25;
                la = new Label();
                Random rand = new Random();
                int r = rand.Next(97, 123);
                x = rand.Next(0, 100);
                la.Text = ((char)r).ToString();
                this.l.Controls.Add(la);//我想用在这个线程内使用主线程的panel控键,但是报错,说这个线程不能调用其他线程的控键作为该线程控键的父控键,那因该怎么改就对了???
                la.Location = new Point(x, y);
                while(true)
                {
                    la.Location = new Point(x,y);
                    y++;
                    Thread.Sleep(500);
                }

            }
        }

    }

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Threading;
namespace WindowsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void Form1_Load(object sender, EventArgs e)
        {
            Class1 cc = new Class1(this.panel1);
            new Thread(new ThreadStart(cc.add)).Start();

        }

        private void panel1_Paint(object sender, PaintEventArgs e)
        {

        }

        private void timer1_Tick(object sender, EventArgs e)
        {

        }

    }
} --------------------编程问答-------------------- CrossThread Exception

看这个
http://blog.csdn.net/LeoMaya/archive/2006/12/26/1463695.aspx

补充：.NET技术 ,  C#