---
title: "Sitecore ASP.NET Rendering SDK API (legacy)"
slug: "sitecore-asp-net-rendering-sdk-api--legacy-"
abstract: "Introduction to the Sitecore ASP.NET Rendering SDK API."
---
# Sitecore ASP.NET Rendering SDK API (legacy)

> [!important]
> If you integrated your app before , it's using the legacy ASP.NET Core Rendering SDK, version 22 or earlier. This SDK is no longer receiving updates, so we recommend that you [upgrade to the latest version of the new](https://doc.sitecore.com/xmc/en/developers/asp-net/latest/asp-net-core-sdk/upgrade-from-v22.html) .

The Sitecore ASP.NET Rendering SDK API documentation contains a complete reference to the namespaces, classes, and methods for developing rendering hosts.