Search from a ListView Binded from Restfull Web Service

Hi everyone,

I have a problem with the "Where" clause to display a ListView when i try to do a search with searchBar ..

My ListView is bind from a Restfull Web Service

!

I tryed this and i can't use "Where" :

I did the same thing with a static List, and it's work fine :

I tried so many things i realy don't know what to do ...

Thanks.