elPreview
//  
this.panelPreview.Location  =  new  System.Drawing.Point(8,  8);
this.panelPreview.Name  =  "panelPreview";
this.panelPreview.Size  =  new  System.Drawing.Size(344,  272);
this.panelPreview.TabIndex  =  1;
//  
//  b_stop
//  
this.b_stop.Enabled  =  false;
this.b_stop.Location  =  new  System.Drawing.Point(360,  368);
this.b_stop.Name  =  "b_stop";
this.b_stop.TabIndex  =  2;
this.b_stop.Text  =  "&Stop";
this.b_stop.Click  +=  new  System.EventHandler(this.b_stop_Click);
//  
//  Form1
//  
this.AutoScaleBaseSize  =  new  System.Drawing.Size(6,  14);
this.ClientSize  =  new  System.Drawing.Size(464,  413);
this.Controls.Add(this.b_stop);
this.Controls.Add(this.panelPreview);
this.Controls.Add(this.b_play);
this.MaximizeBox  =  false;
this.MinimizeBox  =  false;
this.Name  =  "Form1";
this.Text  =  "GoodView  test  Web  Camera";
this.Load  +=  new  System.EventHandler(this.Form1_Load);
this.ResumeLayout(false);

}
#endregion

///  
///  应用程序的主入口点。
///  
[STAThread]
static  void  Main()  
{
Application.Run(new  Form1());
}

private  void  form1_load(object  sender,  system.eventargs  e)
{
b_play.Enabled  =  false;
b_stop.Enabled  =  true;
panelPreview.Size  =  new  Size(330,330);
wc  =  new  WebCamera(  panelPreview.Handle,panelPreview.Width,panelPreview.Height);
wc.StartWebCam();
}

private  void  button1_click(object  sender,  system.eventargs  e)
{
b_play.Enabled  =  false;
b_stop.Enabled  =  true;
panelPreview.Size  =  new  Size(330,330);
wc  =  new  WebCamera(  panelPreview.Handle,panelPreview.Width,panelPreview.Height);
wc.StartWebCam();
}

private  void  b_stop_click(object  sender,  system.eventargs  e)
{
b_play.Enabled  =  true;
b_stop.Enabled  =  false;
wc.CloseWebcam();
}
}
}

from:
http://blog.csdn.net/libiegoupan/archive/2004/09/02/92547.aspx