Linked Edit
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You can use the combo controls to filter and select records to be edited using a DbNetEditCore edit control.
Countries
Cities
Customers
Razor
                                
                                        
DbNetEditCore customerEdit = new DbNetEditCore("northwind", "customers", "customerEdit") { };

DbNetComboCore customerCombo = new DbNetComboCore("northwind", "customers", "companyname", null, "customer")
{
    ForeignKeyColumn = "city",
    Size = 5,
    AutoRowSelect = true
};
customerCombo.Bind(EventType.OnOptionSelected, "showSelectedCustomer");
DbNetComboCore cityCombo = new DbNetComboCore("northwind", "customers", "city", null, "city")
{
    ForeignKeyColumn = "country",
    Size = 5,
    Distinct = true,
    AutoRowSelect = true
};
DbNetComboCore countryCombo = new DbNetComboCore("northwind", "customers", "country", null, "country")
{
    Size = 10,
    Distinct = true,
    AutoRowSelect = true
};
customerCombo.AddLinkedControl(customerEdit);
cityCombo.AddLinkedControl(customerCombo);
countryCombo.AddLinkedControl(cityCombo);
@countryCombo.Render()