Softdog USB detection

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C#2.0

C#

I have purchased SoftDog security dongle for my application now i want to detect its unique id. how can i can i get this. my device do not expose in window drives.

i used WMI but not working

ManagementObjectSearcher theSearcher = new ManagementObjectSearcher("SELECT * FROM Win32_DiskDrive WHERE InterfaceType='USB'");
            foreach (ManagementObject currentObject in theSearcher.Get())
            {
                string id = currentObject["PNPDeviceID"].ToString();
                string[] ids = id.Split('\\');
                idA = ids[ids.Length - 1];
                //idA = label1.Text;
                // textBox1.Text += idA + "\r\n";
                break;
                //label1.Text += currentObject["PNPDeviceID"].ToString() + "\r\n";
                //ManagementObject theSerialNumberObjectQuery = new ManagementObject("Win32_PhysicalMedia.Tag='" + currentObject["PNPDeviceID"] + "'");
                //MessageBox.Show(theSerialNumberObjectQuery["SerialNumber"].ToString());
            }

its SDK includes complex procedure..
but not getting iD of my device.