public void GetAllPeripheralDevices()
 {
     using (FixedAssetsWebService.PeripheralDeviceServiceClient Client = new FixedAssetsWebService.PeripheralDeviceServiceClient())
     {
         Client.Open();
         object[] list = Client.GetAllPeripheralDevices();
         foreach (PeripheralDevice dev in list)
         {
             devices.Add(dev);
         }
     }
 }