A.NET　class　library　for　STAR/CIF　manipulation,　ASTAR,　has　been　developed　and　is　available　at　http://xstar.sourceforge.net/astar/.　The　library　provides　facilities　to　read　and　write　STAR/CIF　files　and　an　object　model　to　manipulate　data　in　STAR/CIF　files.　While　the　library　is　written　in　the　C#　programming　language,　it　can　be　utilized　by　programs　written　in　various　programming　languages　targeting　the.NET　platform.　©　2010　International　Union　of　Crystallography　Printed　in　Singapore　-　all　rights　reserved.