DV ContractChanger_Saving

        void CardControl_Saving(object sender, EventArgs e)
        {
            if (IsContractSelected.HasValue && IsContractSelected.Value)
            {
                var cd = Customizable.FindPropertyItem<CheckEdit>("ChangesContractDuration");
                var pp = Customizable.FindPropertyItem<CheckEdit>("ChangesProlongationTerms");
                var pt = Customizable.FindPropertyItem<CheckEdit>("ChangesPaymentTerms");
                if (cd == null || pp == null || pt == null)
                {
                    Messages.TraceMessage("Checkbox missing");
                    return;
                }

                if (!(cd.Checked)&&!(pp.Checked)&&!(pt.Checked))
                {
                     UiService.ShowMessage("No settings are selected to change contract!");
                };

                if (cd.Checked)
                {
                    var contractDuration = Customizable.FindPropertyItem<ComboBoxEdit>("ContractDuration_New");
                    var selectedItem = (BaseUniversalItemDescription)contractDuration.SelectedItem;

                    if (selectedItem != null)
                    {
                        if (selectedItem.Item.Name.Contains("FixTerm", StringComparison.OrdinalIgnoreCase) ||
                                selectedItem.Item.Name.Contains("TillFullExecution",
                                StringComparison.OrdinalIgnoreCase))
                            {
                                var expirationDate_Reg = LayoutHelper.FindCustomPropertyItem("ExpirationDate_Reg");
                                if (expirationDate_Reg.Control.Name != null || expirationDate_Reg.Control.Text != DateTime.MinValue.ToString() || expirationDate_Reg.Control.Text != DateTime.MaxValue.ToString())
                                {
                                    UiService.ShowMessage("Expiration date must be choosen correctly for selected Contract duration.");
                                };
                            };
                        if (selectedItem.Item.Name.Contains("Other", StringComparison.OrdinalIgnoreCase))
                            {
                                var ExpirationDateValue_Reg = LayoutHelper.FindCustomPropertyItem("ExpirationDateValue_Reg");
                                if (string.IsNullOrEmpty(ExpirationDateValue_Reg.Control.Name))
                                {
                                    UiService.ShowMessage("Expiration comment must be filled for selected Contract duration.");
                                };
                            };
                    }
                    else
                    {
                        UiService.ShowMessage("Contract duration is not set! Or turn off checkbox Appendix changes contract duration.");
                    };
                };

            }
            else
            {
                  UiService.ShowMessage("Document to be changed is not set!");
            };
        }