This is how I get the text out, I believe you can set set the selection range to a page, then you could test that text, might be a little backwards from what you need but could be a place to start.
Microsoft.Office.Interop.Word.Application wordApplication = new Microsoft.Office.Interop.Word.Application();
object missing = Type.Missing;
object fileName = @"c:\file.doc";
object objFalse = false;
wordApplication.DisplayAlerts = Microsoft.Office.Interop.Word.WdAlertLevel.wdAlertsNone;
Microsoft.Office.Interop.Word.Document doc = wordApplication.Documents.Open(ref fileName, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing,ref objFalse, ref missing, ref missing, ref missing, ref missing);
//I belevie you can define a SelectionRange and insert here
doc.ActiveWindow.Selection.WholeStory();
doc.ActiveWindow.Selection.Copy();
IDataObject data = Clipboard.GetDataObject();
string text = data.GetData(DataFormats.Text).ToString();
doc.Close(ref missing, ref missing, ref missing);
doc = null;
wordApplication.Quit(ref missing, ref missing, ref missing);
wordApplication = null;