xaml - wpf binding list inside class not updating -

when want bind observablecollection of strings ui. this:

observablecollection<string> mystrings = new observablecollection<string>(); mystrings.add("hello"); myitemscontrol.itemssource = mystrings; 

then when add/remove elements list, ui updates.

however, when add observablecollection class binding not update:

public class testclass {     public observablecollection<string> mystrings = new observablecollection<string>(); }  testclass mytestclass = new testclass(); mytestclass.mystrings.add("hello"); myitemscontrol.itemssource = mytestclass.mystrings; 

the binding works first time not update when add/remove items. can explain me why happens , how can around it?

you're trying bind field, not property. change class

public class testclass {     public testclass()     {         mystring = new observablecollection<string>();     }      public observablecollection<string> mystrings {get; set;} } 

and should work expected.