help! using webcam to take snapshots

I'm supposed to build a program that takes snapshots from time to time
while the program is running using the webcam (with C#).
In addition the snapshots should be saved in a folder on the comuter.
I don't know how to do that but I managed to find a program that works.
The only problem is that I can't see anything but a black background instead of the picture.

Does anybody has a clue what maybe the problem? or does anybody can give me a link to
a working program? or an explanation on how to communicate with the webcam and all.

I tried to run this program on another computer but still the problem persists.

Any help would be appreciated!
Thanks

Here is the code:

using System;
using System. Collections. Generic;
using System. Linq;
using System. Text;
using WIA;
using System. Net;
using System. Windows. Forms;

namespace cp2
{
class Snapper
{

static void Main(String[] args)
{

Device device = null;

DeviceManager manager = new DeviceManagerClass();

foreach (DeviceInfo info in manager. DeviceInfos)
{

//Here there is only one device attached, for multi device

// we would need to have id of the desired device stored the properties and selected here by device id

if (info. Type == WiaDeviceType. VideoDeviceType)
{

device = info. Connect();

Item item = device. ExecuteCommand(CommandID. wiaCommandTakePicture);

//pull the jpeg type id from registry. Keep this otherwise in properties

Microsoft. Win32. RegistryKey jpegKey = Microsoft. Win32. Registry. ClassesRoot. OpenSubKey(@"CLSID\{D2923B86-15F1-46FF-A19A-DE825F919576}\SupportedExtension\. jpg");

string jpegGuid = jpegKey. GetValue("FormatGUID") as string;

foreach (string format in item. Formats)
{

if (format == jpegGuid)
{

WIA. ImageFile imageFile= item. Transfer(format) as WIA. ImageFile;

Random random = new Random();

string imageFileName = @"c:\" + random. Next(99999) + ". jpeg";

imageFile. SaveFile(imageFileName);

Console. WriteLine("Pictured stored at: " + imageFileName);

}
else
{

Console. WriteLine("Unrecognized img format");

}

break;

}//end if

}//end foreach

}//end Main

}

}
}

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