public bool ThemKH(Businessobject.CKhachhang objec)
 {
     try
     {
         SqlCommand cmd = new SqlCommand("insert into Khachhang values(N'" + objec.MaKH + "', N'" +
                                         objec.TenKH + "',N'" +
                                         objec.Gioitinh + "',N'" +
                                         objec.DiaChi + "','" +
                                         objec.DienThoai + "',N'" +
                                         objec.Email + "')");
         m_ds.ExecuteNoneQuery(cmd);
         return(true);
     }
     catch
     { }
     return(false);
 }
 public bool capnhatKH(Businessobject.CKhachhang objec)
 {
     try
     {
         SqlCommand cmd = new SqlCommand("update Khachhang set TENKHACHHANG=N'" +
                                         objec.TenKH + "',GIOITINH=N'" +
                                         objec.Gioitinh + "',DIACHI=N'" +
                                         objec.DiaChi + "',DIENTHOAI='" +
                                         objec.DienThoai + "',EMAIL=N'" +
                                         objec.Email + "' where MAKHACHHANG=N'" + objec.MaKH + "'");
         m_ds.ExecuteNoneQuery(cmd);
         return(true);
     }
     catch
     { }
     return(false);
 }