Size/Multiple
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Multiple options can be displayed by setting the Size property to the number options to be displayed and setting the MultipleSelect property allows multiple rows to be selected.
Razor
                                
                                        
DbNetComboCore customerCombo = new DbNetComboCore("northwind", "customers", "customerid", "companyname", "customerCombo") { Size = 20, MultipleSelect = true };
customerCombo.Bind(EventType.OnOptionSelected, "showSelectedCustomer");
@customerCombo.Render()