Privew of Webcam

[C# Programming]

i can connect to webcam....
how can i show preview of webcam in picturebox...???


private void btnDecode_Click_1(object sender, EventArgs e)
{
try
{
DeviceManager manager = new DeviceManagerClass();
Device d = null;
foreach (DeviceInfo info in manager.DeviceInfos)
{
d = info.Connect();

}
Item item = d.ExecuteCommand(CommandID.wiaCommandTakePicture);
foreach (string format in item.Formats)
{
WIA.ImageFile imagefile = item.Transfer(format) as WIA.ImageFile;
imagefile.SaveFile("d:\\test2.JPG");

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