# AddTXDocumentViewerExtension Class

> Registers document viewer options and startup validation.

- **Product:** TX Text Control .NET Server
- **Section:** Reference
- **Kind:** Class
- **Introduced:** 34.5.0
- **Namespace:** `TXTextControl.Web.MVC.DocumentViewer.Hosting`
- **Package:** `TXTextControl.Web.DocumentViewer` (assembly `TXTextControl.Web.MVC.DocumentViewer.dll`, from nuget.org, the private NuGet feed or Text Control Offline Packages)
- **Package:** `TXTextControl.Web.DocumentViewer.Classic` (assembly `TXTextControl.Web.MVC.DocumentViewer.dll`, from nuget.org)
- **Path:** TX Text Control .NET Server > Reference > TXTextControl.Web.MVC.DocumentViewer.Hosting > AddTXDocumentViewerExtension Class
- **Web URL:** https://docs.textcontrol.com/tx-text-control-dotnet-server/reference/txtextcontrol-web-mvc-documentviewer-hosting/addtxdocumentviewerextension/
- **LLMs URL:** https://docs.textcontrol.com/tx-text-control-dotnet-server/reference/txtextcontrol-web-mvc-documentviewer-hosting/addtxdocumentviewerextension/llms.txt
- **LLMs-Full URL:** https://docs.textcontrol.com/tx-text-control-dotnet-server/reference/txtextcontrol-web-mvc-documentviewer-hosting/addtxdocumentviewerextension/llms-full.txt

---

## On This Page

- [Description](https://docs.textcontrol.com/tx-text-control-dotnet-server/reference/txtextcontrol-web-mvc-documentviewer-hosting/addtxdocumentviewerextension/#description)
- [Syntax](https://docs.textcontrol.com/tx-text-control-dotnet-server/reference/txtextcontrol-web-mvc-documentviewer-hosting/addtxdocumentviewerextension/#syntax)
- [Members](https://docs.textcontrol.com/tx-text-control-dotnet-server/reference/txtextcontrol-web-mvc-documentviewer-hosting/addtxdocumentviewerextension/#members)

---

## In This Section

- [AddTXDocumentViewerExtension.AddTXDocumentViewer Method](https://docs.textcontrol.com/tx-text-control-dotnet-server/reference/txtextcontrol-web-mvc-documentviewer-hosting/addtxdocumentviewerextension/addtxdocumentviewer-method/llms.txt): Registers the viewer and applies hosting configuration.

---

## Nearby

- **Previous:** [TXTextControl.Web.MVC.DocumentViewer.Hosting namespace](https://docs.textcontrol.com/tx-text-control-dotnet-server/reference/txtextcontrol-web-mvc-documentviewer-hosting/llms.txt)
- **Next:** [AddTXDocumentViewerExtension.AddTXDocumentViewer Method](https://docs.textcontrol.com/tx-text-control-dotnet-server/reference/txtextcontrol-web-mvc-documentviewer-hosting/addtxdocumentviewerextension/addtxdocumentviewer-method/llms.txt)