Razor code

var orderDetailsGrid = new GridModel("[Order Details]");
orderDetailsGrid.Columns = new List
{
    new GridColumn("OrderId", "Invoice Line ID") {ForeignKey = true },
    new GridColumn("ProductID", "Product")  {Lookup = new Lookup("Products","ProductID","ProductName")},
    new GridColumn("UNitPrice", "Price") { Format = "c"},
    new GridColumn("QUantity", "Quantity"),
    new GridColumn("UnitPrice*Quantity", "Cost") { Format = "c", DataType = typeof(Decimal)},
    new GridColumn("Discount", "Discount") { Format = "p"},
    new GridColumn( "UnitPrice*Quantity* (1-Discount)", "Net Cost") { Format = "c", DataType = typeof(Decimal)},
};

orderDetailsGrid.Caption = "Order Details";
orderDetailsGrid.PageSize = 5;

var ordersGrid = new GridModel("Orders");
ordersGrid.Columns = new List
{
    new GridColumn("OrderId", "Order ID") {PrimaryKey = true },
    new GridColumn("customerid", "Customer ID") {ForeignKey = true },
    new GridColumn("employeeid", "Employee") { Lookup = new Lookup("Employees","EmployeeID","coalesce(LastName,'') || ', ' || coalesce(FirstName,'')" ) },
    new GridColumn("OrderDate", "Ordered"),
    new GridColumn("RequiredDate", "Required"),
    new GridColumn("ShippedDate", "Shipped"),
    new GridColumn("Freight", "Cost") { Format = "c"}
};
ordersGrid.LinkedControl = orderDetailsGrid;
ordersGrid.Caption = "Orders";
ordersGrid.PageSize = 5;

var customerSelect = new SelectModel(DataSourceType.SQLite, "Northwind", "customers") { Caption = "Customers", EmptyOption = "Please select a customer", Searchable = true };

customerSelect.Columns = new List
{
    new SelectColumn("CustomerID"),
    new SelectColumn("coalesce(CompanyName,'') || ', ' || coalesce(Address,'') || ', ' || coalesce(City,'')") {DataType = typeof(String)}
};
customerSelect.LinkedControl = ordersGrid;

@(await new DbNetSuiteCore.SelectControl(HttpContext).Render(customerSelect))
@(await new DbNetSuiteCore.GridControl(HttpContext).Render(ordersGrid))
@(await new DbNetSuiteCore.GridControl(HttpContext).Render(orderDetailsGrid))