# Certificates

> Load signing certificates in a WPF application from PFX files or the Windows store, open X509Certificate2UI with WindowInteropHelper and check validity.

- **Product:** TX Text Control .NET for WPF
- **Section:** Documentation
- **Kind:** Topic
- **Path:** TX Text Control .NET for WPF > Digital Signatures > Certificates
- **Web URL:** https://docs.textcontrol.com/tx-text-control-dotnet-wpf/digital-signatures/certificates/
- **LLMs URL:** https://docs.textcontrol.com/tx-text-control-dotnet-wpf/digital-signatures/certificates/llms.txt
- **LLMs-Full URL:** https://docs.textcontrol.com/tx-text-control-dotnet-wpf/digital-signatures/certificates/llms-full.txt

---

## On This Page

- [What a Signing Certificate Needs](https://docs.textcontrol.com/tx-text-control-dotnet-wpf/digital-signatures/certificates/#what-a-signing-certificate-needs)
- [How TX Text Control Takes the Certificate](https://docs.textcontrol.com/tx-text-control-dotnet-wpf/digital-signatures/certificates/#how-tx-text-control-takes-the-certificate)
- [Load the Certificate From a PFX File](https://docs.textcontrol.com/tx-text-control-dotnet-wpf/digital-signatures/certificates/#load-the-certificate-from-a-pfx-file)
- [Let the User Choose a Certificate](https://docs.textcontrol.com/tx-text-control-dotnet-wpf/digital-signatures/certificates/#let-the-user-choose-a-certificate)
- [Find a Certificate by Its Thumbprint](https://docs.textcontrol.com/tx-text-control-dotnet-wpf/digital-signatures/certificates/#find-a-certificate-by-its-thumbprint)
- [Check a Certificate Before Signing](https://docs.textcontrol.com/tx-text-control-dotnet-wpf/digital-signatures/certificates/#check-a-certificate-before-signing)
- [Certificates for Development](https://docs.textcontrol.com/tx-text-control-dotnet-wpf/digital-signatures/certificates/#certificates-for-development)
- [Next Steps](https://docs.textcontrol.com/tx-text-control-dotnet-wpf/digital-signatures/certificates/#next-steps)

---

## Nearby

- **Previous:** [Signing PDF Documents](https://docs.textcontrol.com/tx-text-control-dotnet-wpf/digital-signatures/signing/llms.txt)
- **Next:** [Signature Fields and Signature Appearance](https://docs.textcontrol.com/tx-text-control-dotnet-wpf/digital-signatures/signature-fields/llms.txt)