problem with opencv and emgucv!

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using OpenCVDotNet;
namespace nghich2
{
    public partial class Form1 : Form
    {
        private CVCapture capture;
        public Form1()
        {
            InitializeComponent();
        }
        private void timer1_Tick(object sender, EventArgs e)
        {
            using (CVImage nextFrame = capture.QueryFrame())
            {
                pictureBox1.Image = nextFrame.ToBitmap();
            }
        }
        private void Form1_Load(object sender, EventArgs e)
        {
            capture = new CVCapture();
        }
    }
}