Send Images to Telegram Groups in C# - Complete Guide

Automate Telegram Group Image Sharing with C#

Need to integrate Telegram group image sharing into your .NET applications, Windows services, or enterprise solutions? This guide shows you how to deliver images to Telegram groups using C# and the WhatsMate Telegram Gateway REST API. Perfect for C# developers building Windows applications, enterprise systems, or .NET services that need visual content delivery to group chats.

📋 Prerequisites

Before you begin, ensure you have:

1. A WhatsMate Telegram Gateway account - Required for API access
2. Group membership - The gateway must be a member of the target Telegram group
3. Visual Studio 2019 - Installed and configured (or compatible .NET development environment)
4. Image file ready - Have the image you want to send available locally
5. .NET Framework 4.5 or later - For running the C# application

⚠️ Important: The gateway must be a member of the Telegram group you want to send messages to. The group admin phone number is used to uniquely identify the group.

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

📝 Step-by-Step Implementation

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

1. Set Up Visual Studio Project

Create a new C# Console Application in Visual Studio 2019 and add the required reference:

1. Create new project: File → New → Project → Console App (.NET Framework)
2. Add System.Web.Extensions reference:
   • Right-click on References in Solution Explorer
   • Select “Add Reference”
   • Navigate to “Assemblies” → “Framework”
   • Check “System.Web.Extensions”
   • Click OK

2. Copy the C# Source Code

Copy the following source code into your C# file, replacing the default Program.cs content:

3. Configure a few Parameters

Customize these key parameters in the C# code:

• Line 10: Replace "YOUR_INSTANCE_ID" with your Telegram gateway instance ID
• Line 11: Replace "YOUR_CLIENT_ID_HERE" with your Client ID
• Line 12: Replace "YOUR_CLIENT_SECRET_HERE" with your Client Secret
• Line 21: Replace "Muscle Men Club" with the name of your target Telegram group
• Line 22: Replace "19159876123" with the phone number of the group admin (including country code)
• Line 25: Replace "C:\\TEMP\\cute-girl.jpg" with the full path to your image file
• Line 26: Replace "Lovely Girl" with an optional caption for your image

4. Build and Run

Compile and execute your C# application:

1. Build the solution: Press Ctrl+Shift+B or go to Build → Build Solution
2. Run the application: Press F5 or go to Debug → Start Debugging
3. Check the output: The console will display the response from the Telegram Gateway

🔧 Common Use Cases

This C# integration is ideal for:

• Windows application integration - Add Telegram group image sharing to desktop applications
• Enterprise system notifications - Send visual alerts or reports from business systems to team groups
• .NET service integration - Integrate with Windows Services or ASP.NET applications for automated image delivery
• Automated reporting tools - Generate and deliver charts, screenshots, or visual data to Telegram groups
• Legacy system modernization - Add modern communication capabilities to existing .NET applications

🚀 Get Started Today

Ready to integrate Telegram group image sharing into your C# applications? You’ll need a trial account to access the API. Sign up for a 2-week trial and start sending images to groups from your C# code within minutes!

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