protected void Btn_Del_M_Click(object sender, EventArgs e)
    {
        Apartment apartment   = new Apartment();
        string    managerName = this.managerName.SelectedValue;

        if (apartment.DeleteApartmentManager(managerName))
        {
            Response.Write("<script>alert('宿管信息删除成功!');location.href='apartmentInfoManage.aspx';</script>");
        }
        else
        {
            Response.Write("<script>alert('" + apartment.ErrMessage + "');</script>");
        }
    }