# Check Spelling as You Type

> Color misspelled words red in a WPF RichTextBox as users type: Check the FlowDocument text, find each IncorrectWord with TextPointer and apply the color.

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

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## On This Page

- [Prerequisites](https://docs.textcontrol.com/tx-spell-dotnet-wpf/getting-started/richtextbox/as-you-type/#prerequisites)
- [Create the Project](https://docs.textcontrol.com/tx-spell-dotnet-wpf/getting-started/richtextbox/as-you-type/#create-the-project)
- [Install the NuGet Package](https://docs.textcontrol.com/tx-spell-dotnet-wpf/getting-started/richtextbox/as-you-type/#install-the-nuget-package)
- [Declare the Spell Checker and the RichTextBox](https://docs.textcontrol.com/tx-spell-dotnet-wpf/getting-started/richtextbox/as-you-type/#declare-the-spell-checker-and-the-richtextbox)
- [Write the Code](https://docs.textcontrol.com/tx-spell-dotnet-wpf/getting-started/richtextbox/as-you-type/#write-the-code)
- [Run the Application](https://docs.textcontrol.com/tx-spell-dotnet-wpf/getting-started/richtextbox/as-you-type/#run-the-application)
- [Next Steps](https://docs.textcontrol.com/tx-spell-dotnet-wpf/getting-started/richtextbox/as-you-type/#next-steps)

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## Nearby

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