how to filter list<string> elements=new list<string>

Question

hi all

 

i have a list object  having several files like.xml,.aspx  in that object i want to filter only .xml file.when i filter the result become null and the where condition is not working here

 

what i tried is..

 

var results=listobject.Findall(items=>listobject.contains(".xml")) 

 

here results is Null...

 

can anyone help?