/// <summary>
 /// Try to detect current host application version. (All MS-Office products supports the version property except for Access9 aka Access 2000)
 /// </summary>
 /// <returns>version or null if its failed to detect</returns>
 protected internal double?TryGetApplicationVersion()
 {
     try
     {
         if (_ownerApplication.EntityIsAvailable("Version"))
         {
             double version = Convert.ToDouble(_ownerApplication.Invoker.PropertyGet(_ownerApplication, "Version"), CultureInfo.InvariantCulture);
             return(version);
         }
         else
         {
             return(null);
         }
     }
     catch
     {
         return(null);
     }
 }