public bool Delete_DieuKhien(DieuKhien dk)
 {
     SqlParameter[] pa = new SqlParameter[2];
     pa[0] = new SqlParameter("@matrd", dk.Matrd);
     pa[1] = new SqlParameter("@matt", dk.Matt);
     return SQLProvider.Execute_NonQuery("delete_dieukhien_1", pa);
 }
 public bool Update_DieuKhien(DieuKhien dk)
 {
     SqlParameter[] pa = new SqlParameter[3];
     pa[0] = new SqlParameter("@MaTrD", dk.Matrd);
     pa[1] = new SqlParameter("@MaTT", dk.Matt);
     pa[2] = new SqlParameter("@VaiTro", dk.Mavtro);
     return SQLProvider.Execute_NonQuery("update_DIEUKHIEN_1", pa);
 }
 public bool Update_DieuKhien(DieuKhien dk)
 {
     return a.Update_DieuKhien(dk);
 }
 public bool Delete_DieuKhien(DieuKhien dk)
 {
     return a.Delete_DieuKhien(dk);
 }
 public bool Insert_DieuKhien(DieuKhien dk)
 {
     return a.Insert_DieuKhien(dk);
 }