Send Telegram Messages in C# using Visual Studio 2019 - Complete Guide

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

Posted on June 16, 2022   Share on Facebook Share on LinkedIn Share on Twitter Share on Google+

Last reviewed: January 28, 2026  

🚀 Automate Telegram Messaging with C# .NET

Looking to integrate Telegram messaging into your .NET applications? This guide walks you through sending Telegram messages using C# and the WhatsMate Telegram Gateway REST API. Perfect for .NET developers building Windows applications, services, or enterprise solutions with Visual Studio 2019.

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

đź“‹ 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 2019 - Community, Professional, or Enterprise edition
  4. .NET Framework - Version 4.5 or higher
  5. Basic C# knowledge - Familiarity with Visual Studio and C# development

⚠️ 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.

🎥 Video Walkthrough

đź“ť Step-by-Step Implementation

Follow these steps to send your first Telegram message from a C# application:

1. Copy the C# Template

Copy 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 Telegram gateway instance ID
  • Lines 11-12: Update with your Client ID and Secret
  • Line 19: Specify the target phone number (including the country code, e.g., 12025550108) and provide your message content

3. Add Required Reference

Add the “System.Web.Extensions” reference to your project:

  1. Right-click on your project node in the Solution Explorer panel
  2. Choose “Add” → “Reference…”
  3. Choose “Framework” on the left pane
  4. Look for “System.Web.Extensions” in the middle pane and check the checkbox
  5. Click OK

4. Build and Run Your Application

Build and run the application in Visual Studio to deliver your Telegram message.

🔧 Common Use Cases

This C# integration approach is ideal for:

  • Windows applications - Create desktop utilities with Telegram notifications
  • Enterprise solutions - Integrate Telegram into business .NET applications
  • Windows services - Build background services with messaging capabilities
  • Visual Studio projects - Extend existing C# solutions with Telegram
  • .NET ecosystem applications - Leverage Telegram across the .NET framework

🚀 Get Started Today

Ready to integrate Telegram messaging into your C# 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 Telegram Gateway API documentation.