How to send messages to a Telegram group in C#

Using the WhatsMate Telegram Gateway REST API

Posted on June 26, 2017   Share on Facebook Share on LinkedIn Share on Twitter Share on Google+

Last reviewed: January 4, 2022  

This article shows you how to send a message to a Telegram group in Microsoft’s .NET language: C#.

You MUST obtain the secret gateway number by signing up for a Premium account before you can send a message to a Telegram group. Instructions are available on the official site.

To send a Telegram group message from your C# application, do this:

  1. Create a New Group from your Telegram client.
  2. Add the secret gateway to the group. (You can add other people too!)
  3. Give your group a unique and creative name. It’s very important!
  4. Copy the following source code to the main class in your Console Application in Visual Studio.
  5. Customize the TODO lines in the C# program:
    • Specify your gateway instance ID on line 10.
    • Specify your Client ID and Client secret on lines 11 and 12.
    • Specify the group name on line 19.
    • Specify the content of the message on line 20.
  6. Add the reference “System.Web.Extensions” by doing this:
    • Right-click on your project node in the Solution Explorer panel.
    • Choose “Add” -> “Reference…”
    • Choose “Framework” on the left pane.
    • Look for “System.Web.Extensions” in the middle pane. Check the checkbox in front of it.
    • Click OK.
  7. Build and run the application in Visual Studio.

As mentioned at the beginning of this tutorial, you will need a Premium account to call the above API. Go sign up now.

Happy coding :)