# Signing PDF Documents

> Sign the TextControl document or a merged invoice as PDF in Windows Forms with DigitalSignature, handle FilterException and verify the signatures in code.

- **Product:** TX Text Control .NET for Windows Forms
- **Section:** Documentation
- **Kind:** Topic
- **Path:** TX Text Control .NET for Windows Forms > Digital Signatures > Signing PDF Documents
- **Web URL:** https://docs.textcontrol.com/tx-text-control-dotnet-winforms/digital-signatures/signing/
- **LLMs URL:** https://docs.textcontrol.com/tx-text-control-dotnet-winforms/digital-signatures/signing/llms.txt
- **LLMs-Full URL:** https://docs.textcontrol.com/tx-text-control-dotnet-winforms/digital-signatures/signing/llms-full.txt

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## On This Page

- [How Signing Works in TX Text Control](https://docs.textcontrol.com/tx-text-control-dotnet-winforms/digital-signatures/signing/#how-signing-works-in-tx-text-control)
- [Let the User Save a Signed PDF](https://docs.textcontrol.com/tx-text-control-dotnet-winforms/digital-signatures/signing/#let-the-user-save-a-signed-pdf)
- [Sign a Merged Document in Code](https://docs.textcontrol.com/tx-text-control-dotnet-winforms/digital-signatures/signing/#sign-a-merged-document-in-code)
- [Sign Into Memory and Handle Errors](https://docs.textcontrol.com/tx-text-control-dotnet-winforms/digital-signatures/signing/#sign-into-memory-and-handle-errors)
- [Verify the Signatures in Code](https://docs.textcontrol.com/tx-text-control-dotnet-winforms/digital-signatures/signing/#verify-the-signatures-in-code)
- [After the Document Is Signed](https://docs.textcontrol.com/tx-text-control-dotnet-winforms/digital-signatures/signing/#after-the-document-is-signed)
- [Next Steps](https://docs.textcontrol.com/tx-text-control-dotnet-winforms/digital-signatures/signing/#next-steps)

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## Nearby

- **Previous:** [Overview](https://docs.textcontrol.com/tx-text-control-dotnet-winforms/digital-signatures/overview/llms.txt)
- **Next:** [Certificates](https://docs.textcontrol.com/tx-text-control-dotnet-winforms/digital-signatures/certificates/llms.txt)