Send Voice Note Files to Telegram Groups in C#/.NET - Complete Guide

Automate Telegram Group Voice Note Sharing with C#/.NET

Looking to deliver voice notes, audio recordings, or spoken messages to Telegram groups directly from your C#/.NET applications? This comprehensive guide walks you through sending voice note files (OPUS format) to Telegram groups using C# and the WhatsMate Telegram Gateway REST API. Perfect for .NET developers building Windows applications, enterprise systems, or automation tools that need reliable group voice messaging capabilities.

Note for Visual Studio 2022 users: If you’re using Visual Studio 2022, please read this updated tutorial instead.

📋 Prerequisites

Before you begin, ensure you have:

1. A WhatsMate Telegram Gateway account - Required for API access (sign up for a 2-week trial)
2. Group registration - The Telegram group must be registered with the Gateway first
3. Visual Studio 2019 - .NET development environment with C# support (or compatible IDE)
4. Basic C# knowledge - Familiarity with C# programming and .NET framework concepts
5. Voice note file ready - Have the OPUS file you want to send available locally
6. System.Web.Extensions reference - Required for JSON serialization in .NET projects

⚠️ Important: Telegram groups must be registered with the WhatsMate Telegram Gateway before they can receive messages. Unregistered groups will not receive any messages from the Gateway. Registration instructions are available on the official WhatsMate site.

📝 Step-by-Step Implementation

Follow these steps to send your first voice note file to a Telegram group from a C# application:

1. Copy the C# Code Template

Start by copying the following source code into your C# file:

2. Configure a few Parameters

Customize these key parameters in the C# code:

• Lines 10-12: Replace YOUR_INSTANCE_ID, YOUR_CLIENT_ID_HERE, and YOUR_CLIENT_SECRET_HERE with your Telegram gateway credentials
• Line 21: Replace Muscle Men Club with your target Telegram group name
• Line 22: Replace 19159876123 with the phone number of the group admin (including country code)
• Line 25: Replace C:\\TEMP\\martin-luther-king.opus with the path to your OPUS voice note file
• Line 26: Replace anyname.opus with the desired filename for the voice note
• Line 27: Replace I have a dream with an optional caption for your voice note

3. Add Required Reference

Ensure your project references System.Web.Extensions for JSON serialization:

1. Right-click on References in Solution Explorer
2. Select Add Reference
3. Find and check System.Web.Extensions (under Assemblies → Framework)
4. Click OK

4. Build and Run

Build and run your C# application in Visual Studio 2019 to deliver your voice note to the Telegram group:

1. Press F5 to build and run in debug mode
2. Or use Ctrl+F5 to run without debugging
3. The console will display the API response when the voice note is sent

🔧 Common Use Cases

This automation approach is ideal for .NET developers building:

• AI/TTS integration - Generate voice messages using text-to-speech (TTS) APIs and deliver them to Telegram groups for automated announcements, notifications, or interactive voice responses
• Windows desktop applications - Send voice announcements or updates to Telegram groups from C# Windows Forms or WPF applications
• Enterprise systems - Deliver voice notifications, meeting summaries, or audio alerts to team collaboration groups in .NET enterprise applications
• Customer communication tools - Share voice messages, support responses, or audio updates with customer groups through C#-based CRM systems
• Automation frameworks - Integrate voice messaging into .NET automation frameworks for system monitoring or alerting

🚀 Get Started Today

Ready to automate your group voice note sharing over Telegram with C#? You’ll need a trial account to access the API. Sign up for a 2-week trial and start sending voice note files to groups from your C# applications within minutes!

Next Steps: Once you’ve mastered group voice note sending, explore advanced features like sending audio files to groups, images to groups, documents to groups, or messages to individuals through the WhatsMate Telegram Gateway API documentation.