Webcamera, Multithreading and VFW

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;
using System.Net.Sockets;
using SevenZ.WebCamera;
using SevenZ.ImageProcessing;

namespace SevenZ.WebCam
{
   public partial class FormMain : Form
   {
      int time = 0;
      bool bRunning = false;

      WebCameraDevice camDevice;

      public FormMain()
      {
         InitializeComponent();
         WebCameraDeviceManager camManager = new WebCameraDeviceManager();
         cmbDevices.Items.AddRange(camManager.Devices);
         cmbDevices.SelectedIndex = 0;
      }


      void camDevice_OnCameraFrame(object sender, WebCameraEventArgs e)
      {
         // img processing: 20-30 ms
         ImageProcessing.Filters.Flip(e.Frame, false, true);
         camDevice.Set();

         pictureBox.Image = chkGrayScale.Checked ?
            ImageProcessing.Filters.ToGrayScale(e.Frame) :
            e.Frame;

         this.Text = "FPS: " + (1000 / (Environment.TickCount - time)).ToString();
         time = Environment.TickCount;
         
      }

      private void btnStart_Click(object sender, EventArgs e)
      {
         if (bRunning = !bRunning)
         {
            camDevice = new WebCameraDevice(320, 200, 25, cmbDevices.SelectedIndex, this.Handle.ToInt32());
            camDevice.OnCameraFrame += new WebCameraFrameDelegate(camDevice_OnCameraFrame);
            Thread.CurrentThread.Priority = ThreadPriority.Highest;
            camDevice.Start();
            btnDeviceProperties.Enabled = true;
            btnStart.Text = "Stop";
         }
         else
         {
            camDevice.Stop();
            btnDeviceProperties.Enabled = false;
            btnStart.Text = "Start";
         }


      }

      private void FormMain_FormClosed(object sender, FormClosedEventArgs e)
      {
         if(camDevice != null)
            camDevice.Stop();
      }

      private void btnDevice_Click(object sender, EventArgs e)
      {
         camDevice.ShowVideoDialog();
      }
   }
}