# Check Spelling as You Type

> Color misspelled words red in a Windows Forms RichTextBox as users type with TXSpellChecker.Check and IncorrectWords, and check a TextBox in Validating.

- **Product:** TX Spell .NET for Windows Forms
- **Section:** Documentation
- **Kind:** Topic
- **Path:** TX Spell .NET for Windows Forms > Getting Started > RichTextBox and TextBox > Check Spelling as You Type
- **Web URL:** https://docs.textcontrol.com/tx-spell-dotnet-winforms/getting-started/richtextbox/as-you-type/
- **LLMs URL:** https://docs.textcontrol.com/tx-spell-dotnet-winforms/getting-started/richtextbox/as-you-type/llms.txt
- **LLMs-Full URL:** https://docs.textcontrol.com/tx-spell-dotnet-winforms/getting-started/richtextbox/as-you-type/llms-full.txt

---

## On This Page

- [Prerequisites](https://docs.textcontrol.com/tx-spell-dotnet-winforms/getting-started/richtextbox/as-you-type/#prerequisites)
- [Create the Project](https://docs.textcontrol.com/tx-spell-dotnet-winforms/getting-started/richtextbox/as-you-type/#create-the-project)
- [Install the NuGet Package](https://docs.textcontrol.com/tx-spell-dotnet-winforms/getting-started/richtextbox/as-you-type/#install-the-nuget-package)
- [Add the Controls](https://docs.textcontrol.com/tx-spell-dotnet-winforms/getting-started/richtextbox/as-you-type/#add-the-controls)
- [Write the Code](https://docs.textcontrol.com/tx-spell-dotnet-winforms/getting-started/richtextbox/as-you-type/#write-the-code)
- [Run the Application](https://docs.textcontrol.com/tx-spell-dotnet-winforms/getting-started/richtextbox/as-you-type/#run-the-application)
- [Check a TextBox When It Loses the Focus](https://docs.textcontrol.com/tx-spell-dotnet-winforms/getting-started/richtextbox/as-you-type/#check-a-textbox-when-it-loses-the-focus)
- [Next Steps](https://docs.textcontrol.com/tx-spell-dotnet-winforms/getting-started/richtextbox/as-you-type/#next-steps)

---

## Nearby

- **Previous:** [RichTextBox and TextBox](https://docs.textcontrol.com/tx-spell-dotnet-winforms/getting-started/richtextbox/llms.txt)
- **Next:** [Open the Spell Check Dialog](https://docs.textcontrol.com/tx-spell-dotnet-winforms/getting-started/richtextbox/dialog/llms.txt)