Razor code

var productSelect = new SelectModel(DataSourceType.SQLite, "Northwind", "Products join Categories on Products.CategoryID = Categories.CategoryID") { Searchable = true };
productSelect.Columns = new List()
{
    new SelectColumn("ProductID"),
    new SelectColumn("ProductName"),
    new SelectColumn("CategoryName") {OptionGroup = true}
};
@(await new DbNetSuiteCore.SelectControl(HttpContext).Render(productSelect))