public static void insert(tattendance_stu t)
 {
     using (var data = new instDataContext())
     {
         data.tattendance_stus.InsertOnSubmit(t);
         data.SubmitChanges();
     }
 }
    public static void insert(tattendance_stu t)
    {
        using (var data = new instDataContext())
        {
            data.tattendance_stus.InsertOnSubmit(t);
            data.SubmitChanges();

        }
    }
 public static void update(tattendance_stu t)
 {
     using (var data = new instDataContext())
     {
         var obj = data.tattendance_stus.Single(j => j.enrolmentno == t.enrolmentno);
         obj.name     = t.name;
         obj.att_date = t.att_date;
         obj.status   = t.status;
     }
 }
    public static void update(tattendance_stu t)
    {
        using (var data = new instDataContext())
        {
            var obj = data.tattendance_stus.Single(j => j.enrolmentno == t.enrolmentno);
            obj.name = t.name;
            obj.att_date = t.att_date;
            obj.status = t.status;

        }
    }
 partial void Deletetattendance_stu(tattendance_stu instance);
 partial void Updatetattendance_stu(tattendance_stu instance);
 partial void Inserttattendance_stu(tattendance_stu instance);