The most compact complete solution would be something like:
CultureInfo sloveneCultureInfo = new CultureInfo("sl-SI");
_items = _items.OrderBy(fn => DateTime.ParseExact("01 " + fn, @"dd MMMM yyyy\.\c\s\v", sloveneCultureInfo)).ToList();
. , , :
CultureInfo sloveneCultureInfo = new CultureInfo("sl-SI");
_items.Sort((x, y) => DateTime.ParseExact("01 " + x, @"dd MMMM yyyy\.\c\s\v",sloveneCultureInfo).CompareTo(DateTime.ParseExact("01 " + y, @"dd MMMM yyyy\.\c\s\v", sloveneCultureInfo)));
( , , CurrentCulture, sloveneCultureInfo ).
-, , , , , .
: , .
( IEnumerable IQueryable).
OrderBy , , IOrderedEnumerable<T> ( IOrderedQueryable<T>). , IQueryable, ). , IEnumerable<T>, , , ThenBy , , , .
, :
var x = _items.OrderBy(SomeMethod);
SomeMethod , , x IOrderedEnumerable<T>. , SomeMethod , .
_items, . , Tolist() .
, , Sort(). , ( ), , IComparer<T> ( , , ), , ( , ).
, , , , .
Sort() . , , .
, . -, .
, , .
, Avgust 2010 , , BCL ( ).
, "01", . , - , "01 " + fn, fn - .
, . "01 Avgust 2010.csv". , , , MMMM dd ( ) yyyy . \.\c\s\v, , ".csv", , . , DateTime.ParseExact("01 " + fn, @"dd MMMM yyyy\.\c\s\v", new Culture("sl-SI")), fn - . -, fn => DateTime.ParseExact("01 " + fn, @"dd MMMM yyyy\.\c\s\v", new Culture("sl-SI")).
, _items.OrderBy(fn => DateTime.ParseExact("01 " + fn, @"dd MMMM yyyy\.\c\s\v", new Culture("sl-SI"))) OrderBy, , DateTime.
. , CompareTo() DateTime, ParseExact.
, CultureInfo, sloveneCultureInfo, .