---
title: LinkedDropdownHelper
summary: API reference for LinkedDropdownHelper.
status: draft
owner: SAIF Documentation
last_reviewed: 2026-09-17
library: SAIF.Framework.Web.Mvc
reference_type: package
---

# LinkedDropdownHelper

Renders a `<select>` whose options carry a `data-parent-id`/CSS-class hook so client-side script can filter its visible options based on a parent field's selected value — a "chained dropdown" pattern used across Business Online forms.

## Purpose
- Renders a `<select>` whose options carry a `data-parent-id`/CSS-class hook so client-side script can filter its visible options based on a parent field's selected value — a "chained dropdown" pattern used across Business Online forms.

## Context
- Namespace: `SAIF.Web.Mvc.UI.Extensions`
- Assembly/package: `SAIF.Framework.Web.Mvc (source-shipping NuGet package)`
- Kind: static class

## Public members
| Member | Signature | Purpose |
| --- | --- | --- |
| LinkedDropdownListFor<TModel,TProperty> | `public static MvcHtmlString LinkedDropdownListFor<TModel, TProperty>(this HtmlHelper<TModel> html, Expression<Func<TModel, TProperty>> expression, string parent, IEnumerable<LinkedSelectListItem> items, bool removeDefault = false, object htmlAttributes = null)` | Strongly-typed overload that resolves the field name from the lambda and delegates to `LinkedDropdownList`. |
| LinkedDropdownList(this HtmlHelper, string name, string parent, IEnumerable<LinkedSelectListItem> items, bool removeDefault = false, object htmlAttributes = null) | `public static MvcHtmlString LinkedDropdownList(this HtmlHelper html, string name, string parent, IEnumerable<LinkedSelectListItem> items, bool removeDefault = false, object htmlAttributes = null)` | Builds the `<select>` element, one `<option>` per item, optionally skipping the conventional `-1` "please select" entry; see the "Render a linked (chained) dropdown" operation. |

## Sources
- `src/Web.Mvc/UI/Extensions/LinkedDropdownHelper.cs`