---
title: "onecontact cookbook"
url: https://recursiveai.org/onecontact/cookbook/
description: "Short recipes for common OneContact tasks, each with complete code you can copy."
version: "1.0.0"
---

# onecontact cookbook

Short recipes for common OneContact tasks, each with complete code you can copy.

## Phones

- [Validate a phone number in C#](https://recursiveai.org/onecontact/cookbook/validate-phone-number/index.md): Validate a phone number in C# with OneContact: free, open-source .NET code, a runnable example and real output.
- [Format a phone number as E.164 in C#](https://recursiveai.org/onecontact/cookbook/format-phone-number-e164/index.md): Format a phone number as E.164 in C# with OneContact: free, open-source .NET code, a runnable example and real output.
- [Parse a phone number in C#](https://recursiveai.org/onecontact/cookbook/parse-phone-number/index.md): Parse a phone number in C# with OneContact: free, open-source .NET code, a runnable example and real output.

## Email

- [Validate an email address in C#](https://recursiveai.org/onecontact/cookbook/validate-email-address/index.md): Validate an email address in C# with OneContact: free, open-source .NET code, a runnable example and real output.
- [Extract email addresses from text in C#](https://recursiveai.org/onecontact/cookbook/extract-emails-from-text/index.md): Extract email addresses from text in C# with OneContact: free, open-source .NET code, a runnable example and real output.