[C#] datatable Join 방법

DataRelation drel = new DataRelation("EquiJoin", dt2.Columns["Deptno"], dt1.Columns["Deptno"]);

http://social.msdn.microsoft.com/Forums/en-US/f122d7f4-3b7d-4d93-bd0f-8bb57cd990a4/how-to-join-two-datatables-using-c-no-database-access?forum=adodotnetdataset