Check out example codes for "c# webcam". It will help you in understanding the concepts better.

Code Example 1

using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using AforgeCam;
using AForge.Video;
using AForge.Video.DirectShow;

namespace AforgeCam
{
public partial class Form1 : Form
{
private FilterInfoCollection VideoCaptureDevices;
private VideoCaptureDevice FinalVideo;

// Importante        //
// Installare AForge //

public Form1() // init
{
    InitializeComponent();
    {
        VideoCaptureDevices = new FilterInfoCollection(FilterCategory.VideoInputDevice);
        foreach (FilterInfo VideoCaptureDevice in VideoCaptureDevices)
        {
            comboBox1.Items.Add(VideoCaptureDevice.Name);
        }
        comboBox1.SelectedIndex = 0;
    }
}

private void button1_Click(object sender, EventArgs e)
{
    FinalVideo = new VideoCaptureDevice(VideoCaptureDevices[comboBox1.SelectedIndex].MonikerString);
    FinalVideo.NewFrame += new NewFrameEventHandler(FinalVideo_NewFrame);
    FinalVideo.Start();
}

void FinalVideo_NewFrame(object sender, NewFrameEventArgs eventArgs)
{
    Bitmap video = (Bitmap)eventArgs.Frame.Clone();
    pictureBox1.Image = video;

}

private void button2_Click(object sender, EventArgs e)
{
    FinalVideo.Stop();
}
}

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