Send Voice Notes over Telegram in C#/.NET (Visual Studio 2022) - Complete Guide

Automate Telegram voice note sharing using the WhatsMate Telegram Gateway REST API

Posted on July 20, 2022   Share on Facebook Share on LinkedIn Share on Twitter Share on Google+

Last reviewed: February 4, 2026  

🚀 Automate Telegram Voice Note Sharing with C#/.NET and Visual Studio 2022

Looking to automate Telegram voice note sharing, voice message delivery, or spoken notifications from your modern C#/.NET applications? This guide walks you through sending voice note files (OPUS format) to Telegram users using C# with Visual Studio 2022 and the WhatsMate Telegram Gateway REST API. Perfect for .NET developers using the latest Visual Studio IDE who want to integrate voice messaging into their C#-based workflows.

Note for Visual Studio 2019 users: If you’re using Visual Studio 2019, please read this Visual Studio 2019 tutorial instead.

📋 Prerequisites

Before you begin, ensure you have:

  1. A WhatsMate Telegram Gateway account - Required for API access
  2. Recipient registration - Each recipient must register with the Gateway first
  3. Visual Studio 2022 - Latest .NET development environment with modern C# features
  4. Basic C# knowledge - Familiarity with C# programming and .NET framework
  5. Voice note file ready - Have the OPUS file you want to send available locally
  6. Modern .NET libraries - This version uses System.Text.Json for serialization (included in .NET 6+)

⚠️ Important: Recipients must register with the WhatsMate Telegram Gateway before they can receive messages. Unregistered users 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 to a Telegram user from a C# application using Visual Studio 2022:

1. Create a New Visual Studio 2022 Project

  1. Open Visual Studio 2022
  2. Create a new Console Application project
  3. Select .NET 6.0 or later as the target framework

2. Copy the C# Code Template

Replace the default Program.cs content with the following source code:

3. 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 gateway instance ID, Client ID, and Secret
  • Line 20: Replace 12025550105 with the target phone number (including the country code)
  • Line 22: Replace C:\\TEMP\\martin-luther-king.opus with the path to your OPUS voice note file
  • Line 23: Replace anyname.opus with the desired filename for the voice note
  • Line 24: Replace I have a dream with an optional caption for your voice note

4. Send Your Voice Note

Build and run your C# application in Visual Studio 2022 to deliver your voice note to Telegram.

🔧 Common Use Cases

This automation approach is ideal for:

  • AI/TTS integration - Generate voice messages using text-to-speech (TTS) APIs and deliver them to Telegram for automated announcements, notifications, or interactive voice responses
  • Cloud-native applications - Integrate Telegram voice note sharing with cloud-based .NET applications and microservices
  • Modern desktop applications - Add Telegram voice note sharing capabilities to WPF, WinUI, or MAUI applications
  • Customer service automation - Send voice responses or information to clients via Telegram using the latest .NET technologies
  • Audio notifications - Deliver spoken alerts or voice notifications from .NET 6+ systems

🚀 Get Started Today

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

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