Send WhatsApp Messages in C# using Visual Studio 2022 - Complete Guide

Automate WhatsApp messaging using C# .NET and the WhatsMate WA Gateway REST API

Posted on July 18, 2022   Share on Facebook Share on LinkedIn Share on Twitter Share on Google+

Last reviewed: January 28, 2026  

🚀 Automate WhatsApp Messaging with C# .NET and VS 2022

Looking to integrate WhatsApp messaging into your modern .NET applications? This guide walks you through sending WhatsApp messages using C# and the WhatsMate WA Gateway REST API with Visual Studio 2022. Perfect for .NET developers building contemporary Windows applications, services, or enterprise solutions with the latest Visual Studio IDE.

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

📋 Prerequisites

Before you begin, ensure you have:

  1. A WhatsMate WA Gateway account - Required for API access
  2. Recipient registration - Each recipient must register with the Gateway first
  3. Visual Studio 2022 - Community, Professional, or Enterprise edition
  4. .NET 6.0 or higher - Modern .NET runtime and SDK
  5. Basic C# knowledge - Familiarity with Visual Studio 2022 and C# development

⚠️ Important: Recipients must register with the WhatsMate WA 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 WhatsApp message from a C# application in Visual Studio 2022:

1. Copy the C# Template

Start by copying the following source code to the main class in your Console Application in Visual Studio:

2. Configure a few Parameters

Customize these key parameters in the C# code:

  • Line 10: Replace with your gateway instance ID
  • Lines 11-12: Update with your Client ID and Secret
  • Line 19: Specify the target phone number (including the country code) and your message content

3. Build and Run

Build and run your application in Visual Studio 2022 to deliver your WhatsApp message.

🔧 Common Use Cases

This C# integration with Visual Studio 2022 is ideal for:

  • Modern Windows applications - Add messaging features to WinUI 3 or MAUI apps
  • Cloud-native services - Integrate WhatsApp into microservices or serverless functions
  • Enterprise solutions - Build business applications with modern .NET capabilities
  • Cross-platform development - Create solutions that work across Windows, macOS, and Linux

🚀 Get Started Today

Ready to integrate WhatsApp messaging into your modern .NET applications? You’ll need a trial account to access the API. Sign up for a 2-week trial and start sending messages within minutes!

Next Steps: Once you’ve mastered basic message sending, explore advanced features like sending images, documents, or group messages through the WhatsMate API documentation.