Send Images over Telegram in C#/.NET - Complete Guide

🚀 Automate Telegram Image Sharing with C#/.NET

Looking to automate Telegram image sharing, visual notifications, or media delivery from your C#/.NET applications? This guide walks you through sending images to Telegram users using C# and the WhatsMate Telegram Gateway REST API. Perfect for .NET developers, Windows application builders, and automation enthusiasts who want to integrate visual content delivery into their C#-based workflows.

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
2. Recipient registration - Each recipient must register with the Gateway first
3. Visual Studio 2019 - .NET development environment (or compatible IDE)
4. Basic C# knowledge - Familiarity with C# programming and .NET framework
5. Image file ready - Have the image you want to send available locally
6. System.Web.Extensions reference - Required for JSON serialization

⚠️ 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 image to a Telegram user 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:

• Line 10: Replace YOUR_INSTANCE_ID with your Telegram gateway instance ID
• Lines 11-12: Update YOUR_CLIENT_ID_HERE and YOUR_CLIENT_SECRET_HERE with your Client ID and Secret
• Line 20: Replace 12025550105 with the target phone number (including the country code)
• Line 22: Replace C:\\TEMP\\cute-girl.jpg with the path to your image file
• Line 23: Replace Lovely Gal with an optional caption for your image

3. Add Required Reference

In Visual Studio, add a reference to System.Web.Extensions for JSON serialization support:

1. Right-click on References in your project
2. Select “Add Reference”
3. Find and check “System.Web.Extensions”
4. Click OK

4. Send Your Image

Build and run your C# application in Visual Studio to deliver your image to Telegram:

1. Press F5 to build and run in debug mode
2. Or use Ctrl+F5 to run without debugging
3. Check the console output for success confirmation

🔧 Common Use Cases

This automation approach is ideal for:

• Windows desktop applications - Send images to Telegram from Windows Forms or WPF apps
• Automated reporting systems - Deliver visual reports and charts via Telegram from .NET services
• Backend services - Integrate Telegram image sharing into ASP.NET web applications
• Scheduled tasks - Use Windows Task Scheduler with .NET console apps for regular image delivery
• Business applications - Add Telegram notifications with images to enterprise .NET solutions

🚀 Get Started Today

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

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