using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Windows.Forms;

using System.Text;

using Autodesk.Navisworks.Api.Controls;

      static public void TestSavedItemReference()
      {
         //first check we have some data to test this with
         if (Autodesk.Navisworks.Api.Application.ActiveDocument.SelectionSets.RootItem.Children.Count > 0)
         {
            //get the first child item
            SavedItem item = Autodesk.Navisworks.Api.Application.ActiveDocument.SelectionSets.RootItem.Children[0];

            //create the SavedItemReference
            SavedItemReference reference =
               Autodesk.Navisworks.Api.Application.ActiveDocument.SelectionSets.CreateReference(item);

            //check the resolved reference
            if (Autodesk.Navisworks.Api.Application.ActiveDocument.SelectionSets.ResolveReference(reference)
               == Autodesk.Navisworks.Api.Application.ActiveDocument.SelectionSets.RootItem.Children[0])
            {
               MessageBox.Show("resolved item matches the first child item");
            }

            //remove the SavedItem
            bool val = Autodesk.Navisworks.Api.Application.ActiveDocument.SelectionSets.Remove(item);

            //check resolved reference is no longer valid
            if (Autodesk.Navisworks.Api.Application.ActiveDocument.SelectionSets.ResolveReference(reference)
               == null)
            {
               MessageBox.Show("SavedItem no longer exists");
            }
         }
      }