# .NET 9

.NET 9 is a release of the cross-platform, open-source .NET developer platform for building applications, with a focus on cloud-native apps and performance.

This is one page of public article previews, not the complete archive. Follow Next page to continue. Summaries are not the original full articles.

## How to Connect Your Twilio Agent to External APIs

DevFeed: [How to Connect Your Twilio Agent to External APIs](<https://devfeed.tech/articles/how-to-connect-your-twilio-agent-to-external-apis-31438.md>)

Original publisher: [Read original article](<https://www.twilio.com/en-us/blog/developers/tutorials/product/how-to-connect-twilio-agent-to-external-apis>)

Author: Amanda Lange

Published: 2026-09-15T00:00:00Z

Content type: tutorial

Language: en

Sources: [Twilio Blog](<https://devfeed.tech/sources/twilio-blog.md>)

Topics: [AI Agent](<https://devfeed.tech/topics/ai-agent.md>), [API](<https://devfeed.tech/topics/api.md>), [C#](<https://devfeed.tech/topics/csharp.md>), [.NET 9](<https://devfeed.tech/topics/net-9.md>), [REST API](<https://devfeed.tech/topics/rest-api.md>), [SDKs](<https://devfeed.tech/topics/sdks.md>), [OpenAI](<https://devfeed.tech/topics/openai.md>)

Tags: [agent](<https://devfeed.tech/tags/agent.md>), [api](<https://devfeed.tech/tags/api.md>), [apis](<https://devfeed.tech/tags/apis.md>), [c-sharp](<https://devfeed.tech/tags/c-sharp.md>), [developer-insights](<https://devfeed.tech/tags/developer-insights.md>), [environment-variables](<https://devfeed.tech/tags/environment-variables.md>), [how-to](<https://devfeed.tech/tags/how-to.md>), [net](<https://devfeed.tech/tags/net.md>), [net-9](<https://devfeed.tech/tags/net-9.md>), [ngrok](<https://devfeed.tech/tags/ngrok.md>), [openai](<https://devfeed.tech/tags/openai.md>), [rest-api](<https://devfeed.tech/tags/rest-api.md>), [sdk](<https://devfeed.tech/tags/sdk.md>)

### AI overview

This tutorial explains how to build a voice AI agent with C# and .NET 9 using Twilio Conversation Relay. It demonstrates LLM tool calling to fetch live data from an external REST API and covers project setup, required packages, environment variables, and API key storage.

### Source excerpt

How to Connect Your Twilio Agent to External APIs

## How to Approve Real Users and Block Fake Accounts at Sign Up with Lookup and Verify in C#

DevFeed: [How to Approve Real Users and Block Fake Accounts at Sign Up with Lookup and Verify in C#](<https://devfeed.tech/articles/how-to-approve-real-users-and-block-fake-accounts-at-sign-up-with-lookup-and-verify-in-c-16094.md>)

Original publisher: [Read original article](<https://www.twilio.com/en-us/blog/developers/tutorials/product/block-fake-accounts-lookup-verify-csharp>)

Author: Amanda Lange, Dhruv Patel, Kelley Robinson

Published: 2026-08-28T00:00:00Z

Content type: tutorial

Language: en

Sources: [Twilio Blog](<https://devfeed.tech/sources/twilio-blog.md>)

Topics: [C#](<https://devfeed.tech/topics/csharp.md>), [API](<https://devfeed.tech/topics/api.md>), [.NET 9](<https://devfeed.tech/topics/net-9.md>)

Tags: [auth](<https://devfeed.tech/tags/auth.md>), [c-sharp](<https://devfeed.tech/tags/c-sharp.md>), [developer-insights](<https://devfeed.tech/tags/developer-insights.md>), [fake-accounts](<https://devfeed.tech/tags/fake-accounts.md>), [fraud](<https://devfeed.tech/tags/fraud.md>), [how-to](<https://devfeed.tech/tags/how-to.md>), [lookup](<https://devfeed.tech/tags/lookup.md>), [onboarding](<https://devfeed.tech/tags/onboarding.md>), [sign-up](<https://devfeed.tech/tags/sign-up.md>), [verification](<https://devfeed.tech/tags/verification.md>), [verify](<https://devfeed.tech/tags/verify.md>)

### AI overview

This tutorial shows C# developers how to combine Twilio Lookup and Twilio Verify to screen phone numbers during sign-up, verify identity, and block fake accounts. It covers line-type, reachability, identity-match, and phone-possession checks.

### Source excerpt

How to Approve Real Users and Block Fake Accounts at Sign Up with Lookup and Verify in C Sharp