Send PDF Files to Telegram Groups in C# - Complete Guide

Automate Telegram Group Document Sharing with C#

Need to integrate Telegram group PDF sharing into your C# applications for Windows services, enterprise solutions, or .NET applications? This guide shows you how to deliver PDF files to Telegram groups using C# and the WhatsMate Telegram Gateway REST API. Perfect for C# developers building Windows applications, .NET services, or enterprise solutions that need document 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 for C# development
4. PDF file ready - Have the document you want to send available locally
5. .NET Framework 4.5+ - Required for the WebClient and JavaScriptSerializer classes

⚠️ 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.

📄 Visual Studio Version: This tutorial is for Visual Studio 2019. If you’re using Visual Studio 2022, please refer to the VS2022-specific tutorial.

📝 Step-by-Step Implementation

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

1. Set Up Your Visual Studio Project

Create a new C# Console Application in Visual Studio 2019:

1. Open Visual Studio 2019
2. Click “Create a new project”
3. Select “Console App (.NET Framework)”
4. Name your project and click “Create”

2. Add Required References

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

1. Right-click on your project in Solution Explorer
2. Select “Add” → “Reference”
3. Check “System.Web.Extensions” in the Assemblies list
4. Click “OK”

3. Copy the C# Source Code

Replace the contents of Program.cs with the following source code:

4. 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\\subwaymap.pdf" with the path to your PDF file
• Line 26: Replace "anyname.pdf" with the desired filename for the document
• Line 27: Replace "Check this out" with an optional caption for your PDF

5. Build and Run Your Application

1. Press F5 or click “Start” to build and run your application
2. The console will display the API response from the Telegram Gateway
3. Check your Telegram group to confirm the PDF was delivered successfully

🔧 Common Use Cases

This C# integration is ideal for:

• Windows application integration - Add Telegram group PDF sharing to Windows Forms or WPF applications
• Enterprise .NET solutions - Integrate with enterprise systems for automated document delivery
• Windows services - Create background services that send PDF reports to Telegram groups
• ASP.NET web applications - Add PDF sharing capabilities to web applications
• Legacy system modernization - Add modern document sharing to existing C# applications

🚀 Get Started Today

Ready to integrate Telegram group PDF 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 PDF documents to groups from your C# code within minutes!

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