返回集合列表
DataClasses1DataContext dd=new DataClasses1DataContext ();
DataTable dt=new DataTable();
var tr = from p in dd.HRHTLBs select p;
var hy = from l in dd.HRHYZDs select new { l.HRHYZD_ZGBH, l.HRHYZD_ZGXM,l.HRHYZD_CSRQ};
IQueryable 与DataTable 的区别需要深入了解！
