C#

 public Form1()
       {
           InitializeComponent();
           webcam = new FilterInfoCollection(FilterCategory.VideoInputDevice);
           foreach (FilterInfo VideoCaptureDevice in webcam)
           {
               comboBox1.Items.Add(VideoCaptureDevice.Name);

           }
           comboBox1.SelectedIndex = 1;


           cam = new VideoCaptureDevice(webcam[comboBox1.SelectedIndex].MonikerString);
           cam.NewFrame += new NewFrameEventHandler(cam_NewFrame);
           cam.Start();
       }

private FilterInfoCollection webcam;
       private VideoCaptureDevice cam;
       Bitmap bitmap;


 void cam_NewFrame(object sender, NewFrameEventArgs eventArgs)
       {
           bitmap = (Bitmap)eventArgs.Frame.Clone();

           pictureBox1.Image = bitmap;
       }

       private void pictureBox1_Click(object sender, EventArgs e)
       {
           pictureBox1.Image = bitmap;
       }

       private void button3_Click(object sender, EventArgs e)
       {
           if (cam.IsRunning)
           {
               cam.Stop();
           }
       }

       private void button2_Click(object sender, EventArgs e)
       {
           Bitmap current = (Bitmap)bitmap.Clone();
           string filepath = Environment.CurrentDirectory;
           string fileName = System.IO.Path.Combine(filepath, @"name.bmp");
           current.Save(fileName);
           current.Dispose();
       }