[System][Usb] apply NotSupportedException (#183)

Signed-off-by: lokilee73 <changjoo.lee@samsung.com>

diff --git a/src/Tizen.System.Usb/Usb/UsbManager.cs b/src/Tizen.System.Usb/Usb/UsbManager.cs
index 157a4c9..ce46663 100755 (executable)
--- a/src/Tizen.System.Usb/Usb/UsbManager.cs
+++ b/src/Tizen.System.Usb/Usb/UsbManager.cs
@@ -51,7 +51,7 @@ namespace Tizen.System.Usb
         /// <since_tizen> 4 </since_tizen>
         public UsbManager()
         {
-            if (_context == null) throw new NotSupportedException("USB host operations are not supported in this device");
+            if (_context == null) Interop.ErrorCode.NotSupported.ThrowIfFailed("USB host operations are not supported in this device");
 
             IntPtr hotpluggedAttachHandle, hotpluggedDetachHandle;
             _context.SetHotplugCb(HostHotplugAttachCallback, Interop.HotplugEventType.Attach,