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

Automate Telegram PDF Sharing with C#/.NET and Visual Studio 2022

Looking to automate Telegram PDF document sharing, report delivery, or document distribution from your modern C#/.NET applications? This guide walks you through sending PDF files 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 document delivery 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. PDF file ready - Have the PDF 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.

🎥 Video Walkthrough

📝 Step-by-Step Implementation

Follow these steps to send your first PDF file to a Telegram user from a C# application using Visual Studio 2022:

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\\subwaymap.pdf with the path to your PDF file
• Line 23: Replace anyname.pdf with your preferred filename for the recipient
• Line 24: Replace Check this out with your desired caption

3. Send Your PDF

Build and run your C# application in Visual Studio 2022 to deliver your PDF 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 modern automation approach is ideal for:

• Modern Windows applications - Send PDF reports to Telegram from Windows Forms, WPF, or MAUI apps
• ASP.NET Core web applications - Integrate Telegram PDF sharing into modern web apps
• Microservices and APIs - Add Telegram document delivery to .NET microservices
• Cloud-native applications - Use with Azure Functions or AWS Lambda for serverless PDF delivery
• Cross-platform .NET apps - Works with .NET Core on Linux, macOS, and Windows
• Business automation - Automatically send PDF invoices, reports, and documents via Telegram
• Document management systems - Integrate Telegram PDF sharing with document processing workflows
• Reporting systems - Automatically deliver PDF reports to stakeholders via Telegram

🚀 Get Started Today

Ready to automate your PDF sharing over Telegram with modern C#/.NET and Visual Studio 2022? You’ll need a trial account to access the API. Sign up for a 2-week trial and start sending PDF documents within minutes!

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