//
 // This conversion is necessary because we could be called from the Search charm
 //
 private RisQueryParameter NavigationParameterToSearchParameter(string s)
 {
     try
     {
         var p = RisQueryParameterSerializeable.Deserialize(s);
         return(p);
     }
     catch (Exception ex)
     {
         // If it cannot be deserialized, we assume it to be a fulltext search
         return(new RisFulltextQueryParameter(s));
     }
 }
        public void Submit()
        {
            ValidationMessage = "";

            var p = Validate();

            if (null == p)
            {
                return;
            }

            string navParam = RisQueryParameterSerializeable.Serialize(p);

            NavigationService.Navigate <SearchResultsPage>(navParam);
        }