Deadlock when using Control.Invoke()

I have to do as an assignment to school a client-server application using .NET Remoting. The client has a class that contains some forms, and it is also an observer to an object from the server. When the server notifies it, it tries to update a Property of a form and a deadlock always occurs. I tried using Control.Invoke and Control.BeginInvoke with no luck.Here is some snippet of code

LibraryController(Client)

 public class LibraryController :MarshalByRefObject,IObserver{

      private SubscriberGUI subscriberGUI;(this is a form with a datagridview and some buttons)


      public void notifyObserver()
      {
        //this is part of IObserver interface and it is called by the server
        refreshAllTables();
      }

      private void refreshAllTables()
    {
        refreshSubscriberGUIAvailableBooksTable();
        ...
    }


    private void refreshSubscriberGUIAvailableBooksTable()
    {
        if (subscriberGUI != null)
        {

            DataTable table = initialiseBooksDataTable();
            foreach (Book bk in bookService.getAvailableBooks())
            {
                table.Rows.Add(bk.getId(), bk.getAuthor(), bk.getTitle(), bk.getSubscriberId());
            }
            if (subscriberGUI.AvailableBooksDataGridView.InvokeRequired)
            {
                SetDataSourceToAvailableBooksDataGridView(table);
            }
            else
            {
                subscriberGUI.AvailableBooksDataGridView.DataSource = table;
            }


        }

    }


    delegate void SetDataSourceCallback( DataTable table);

    private void SetDataSourceToAvailableBooksDataGridView(DataTable table)
    {
        // InvokeRequired required compares the thread ID of the
        // calling thread to the thread ID of the creating thread.
        // If these threads are different, it returns true.


        if (subscriberGUI.AvailableBooksDataGridView.InvokeRequired)
        {

            SetDataSourceCallback d = new SetDataSourceCallback(SetDataSourceToAvailableBooksDataGridView);

            this.subscriberGUI.BeginInvoke(d, new object[] {table });


        }
        else
        {
            subscriberGUI.AvailableBooksDataGridView.DataSource = table;
        }
    }


 }

Could anyone shed a light on the problem? I would appreciate your help!!