[Modify] Replace it

Author: sta

Diff for: websocket-sharp/Net/HttpListener.cs

@@ -947,11 +947,11 @@ public HttpListenerContext GetContext ()
     public void Start ()
     {
       if (_disposed)
-        throw new ObjectDisposedException (_objectName);
+        throw new ObjectDisposedException (ObjectName);
 
       lock (_sync) {
         if (_disposed)
-          throw new ObjectDisposedException (_objectName);
+          throw new ObjectDisposedException (ObjectName);
 
         lock (_contextRegistrySync) {
           if (_listening)