How to delete all the item from list in c# windows phone 8 -

hi working on windows phone chat application , have save user chat in local db , want clear conversation , not able delete chat , following code delete 1 item @ time following code using:

var del_chat = dbconndelete_user.query<savedmsg>("select * savedmsg                                chatuserid='" + totalseletion + "'").firstordefault(); dbconndelete_user.delete(del_chat); 

if want clear list, can this

  list<myclass> mylist = new slist<myclass>();   mylist.clear(); //remove elements list  

this work observablecollection too

observablecollection<myclass> myobservable = new observablecollection<myclass> (); myobservable.clear(); 

i suggest use observablecollection represents dynamic data collection provides notifications when items added, removed, or when whole list refreshed. reflected in user interface. pros of observable collection instead of list