WinForms C# using MS Word 2010 spell check functionality displays save dialogue

I'm using MS Word's spell checking functionality in my C# WinForms application. This works fine with Office 2007, but for machines with Office 2010 installed I have some trouble. First I had the problem that the word application opened behind my current window and the application would seem frozen. Using alt+tab I can get to the word app. This I fixed by using a workaround by minimizing and the maximizing the word app to show up the spell check dialogue in front of my application's window. Now My last problem is that when I close the spell check window, I still get a 'save' dialogue asking me if I want to save the word document. I just want to close the word app without saving eg. don't want the save dialogue window to display.

 Word._Application app = new Word.Application();

        //int errors = 0;
        if (p_TextToCheck != "")
        {
            app.Visible = false;

            // Setting these variables is comparable to passing null to the function.
            // This is necessary because the C# null cannot be passed by reference.
            object template = Missing.Value;
            object newTemplate = Missing.Value;
            object documentType = Missing.Value;
            object visible = false;

            Word._Document doc1 = app.Documents.Add(ref template, ref newTemplate, ref documentType, ref visible);
            doc1.Words.First.InsertBefore(p_TextToCheck);
            //Word.ProofreadingErrors spellErrorsColl = doc1.SpellingErrors;
            //errors = spellErrorsColl.Count;
            //doc1.Activate();
            //app.ShowMe();
            foreach (Word.Window window in app.Windows)
            {
                window.WindowState = Word.WdWindowState.wdWindowStateMinimize;
                window.WindowState = Word.WdWindowState.wdWindowStateMaximize;
            }


            object optional = Missing.Value;

            doc1.CheckSpelling(
                ref optional, ref optional, ref optional, ref optional, ref optional, ref optional,
                ref optional, ref optional, ref optional, ref optional, ref optional, ref optional);

            //label1.Text = errors + " errors corrected ";
            object first = 0;
            object last = doc1.Characters.Count - 1;
            p_TextToCheck.Value = doc1.Range(ref first, ref last).Text;

            object saveChanges = false;
            object originalFormat = Missing.Value;
            object routeDocument = Missing.Value;
            doc1.Close(ref saveChanges, ref originalFormat, ref routeDocument);
        }

        object saveChanges1 = false;
        object originalFormat1 = Missing.Value;
        object routeDocument1 = Missing.Value;

        app.Quit(ref saveChanges1, ref originalFormat1, ref routeDocument1);