How to send an audio file to a Telegram group in C# using Visual Studio 2022

This article shows you how to send an audio file (e.g. an MP3 file) to a registered Telegram group in Microsoft’s .NET language: C# using Visual Studio 2022.

If you are using Visual Studio 2019, please read this tutorial instead.

To send a Telegram message containing an audio file in C# using Visual Studio 2022, do this:

First, learn how to send a simple text message to a group on the official site.
With the above knowledge, you can now download our sample code.

Locate the file cs_vs2022/group-send-telegram-mp3.cs.

	using System;
	using System.Net;
	using System.Text.Json;
	using System.IO;
	using System.Text;

	class TelegramGroupMp3Sender
	{
	// TODO: Replace the following with your gateway instance ID, client ID and secret!
	private static string INSTANCE_ID = "YOUR_INSTANCE_ID";
	private static string CLIENT_ID = "YOUR_CLIENT_ID_HERE";
	private static string CLIENT_SECRET = "YOUR_CLIENT_SECRET_HERE";

	private static string AUDIO_GROUP_API_URL = "https://api.whatsmate.net/v3/telegram/group/audio/message/" + INSTANCE_ID;

	static void Main(string[] args)
	{
	TelegramGroupMp3Sender mp3Sender = new TelegramGroupMp3Sender();

	// TODO: Put down group name and group admin below
	string group_name = "Muscle Men Club";
	string group_admin = "19159876123";

	// TODO: Remember to copy the MP3 file from ..\assets to the TEMP directory!
	string base64Content = convertFileToBase64("C:\\TEMP\\ocean-waves.mp3");
	string fn = "anyname.mp3";
	string caption = "Enjoy the nature";

	mp3Sender.sendAudio(group_name, group_admin, base64Content, fn, caption);

	Console.WriteLine("Press Enter to exit.");
	Console.ReadLine();
	}

	// http://stackoverflow.com/questions/25919387/c-sharp-converting-file-into-base64string-and-back-again
	static public string convertFileToBase64(string fullPathToDoc)
	{
	Byte[] bytes = File.ReadAllBytes(fullPathToDoc);
	String base64Encoded = Convert.ToBase64String(bytes);
	return base64Encoded;
	}

	public bool sendAudio(string group_name, string group_admin, string base64Content, string fn, string caption)
	{
	bool success = true;

	try
	{
	HttpWebRequest httpRequest = (HttpWebRequest)WebRequest.Create(AUDIO_GROUP_API_URL);
	httpRequest.Method = "POST";
	httpRequest.Accept = "application/json";
	httpRequest.ContentType = "application/json";
	httpRequest.Headers["X-WM-CLIENT-ID"] = CLIENT_ID;
	httpRequest.Headers["X-WM-CLIENT-SECRET"] = CLIENT_SECRET;

	GroupAudioPayload payloadObj = new GroupAudioPayload() { group_name = group_name, group_admin = group_admin, audio = base64Content, filename = fn, caption = caption};
	string postData = JsonSerializer.Serialize(payloadObj);

	using (var streamWriter = new StreamWriter(httpRequest.GetRequestStream()))
	{
	streamWriter.Write(postData);
	}

	var httpResponse = (HttpWebResponse)httpRequest.GetResponse();
	using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
	{
	var result = streamReader.ReadToEnd();
	Console.WriteLine(result);
	}
	}
	catch (WebException webExcp)
	{
	Console.WriteLine("A WebException has been caught.");
	Console.WriteLine(webExcp.ToString());
	WebExceptionStatus status = webExcp.Status;
	if (status == WebExceptionStatus.ProtocolError)
	{
	Console.Write("The REST API server returned a protocol error: ");
	HttpWebResponse? httpResponse = webExcp.Response as HttpWebResponse;
	Stream stream = httpResponse.GetResponseStream();
	StreamReader reader = new StreamReader(stream);
	String body = reader.ReadToEnd();
	Console.WriteLine((int)httpResponse.StatusCode + " - " + body);
	success = false;
	}
	}
	catch (Exception e)
	{
	Console.WriteLine("A general exception has been caught.");
	Console.WriteLine(e.ToString());
	success = false;
	}

	return success;
	}

	public class GroupAudioPayload
	{
	public string group_name { get; set; }
	public string group_admin { get; set; }
	public string audio { get; set; }
	public string filename { get; set; }
	public string caption { get; set; }
	}

	}

view raw group-send-telegram-mp3.cs hosted with ❤ by GitHub

Study the C# source code and customize the TODO/FIXME lines.
Run the C# program in Visual Studio to send your group the first MP3 file!

Happy coding :)