private List<Credit> ListaZaznaczonychWnioskow = new List<Credit>();

        protected void Page_Load(object sender, EventArgs e)
        {
            grdMonity.DataSource = null;
            grdMonity.DataSource = DataManager.GetPenaltyReminderList().OrderBy(x => x.Balance).ToList();
            grdMonity.DataBind();

            foreach (GridViewRow monit in grdMonity.Rows)
            {
                if (monit.RowType == DataControlRowType.DataRow)
                {
                    CheckBox chk = (CheckBox)monit.FindControl("chkZaznaczRekord");

                    // jeśli zaznaczone
                    if (chk.Checked && chk != null)
                    {
                        // dodaj wniosek do listy
                        ListaZaznaczonychWnioskow.Add(DataManager.GetPenaltyReminder(Int32.Parse(monit.Cells[1].Text)));
                    }
                }
            }
        }