Sign In

Install Telega package. If you use dotnet CLI just type dotnet add package Telega.

Add imports:

using System;

using Telega.Client;

Prepare API credentials. You can read how to obtain full-fledged credentials here.

// This credentials are Telegram Desktop limited test credentials.

// They can cause 'The protocol is violated' error sometimes.

var apiId = 17349;

var apiHash = "344583e45741c457fe1862106095a5eb";

Create the client:

var tg = await TelegramClient.Connect(apiId);

Sign in with code verification:

var phone = "YOUR_PHONE_HERE";

var codeHash = await tg.Auth.SendCode(apiHash, phone);

var code = Console.ReadLine();

await tg.Auth.SignIn(phone, codeHash, code);

It will throw TgPasswordNeededException if there is a cloud password. So here is what you need to do:

var password = "YOUR_PASSWORD_HERE";

await tg.Auth.CheckPassword(password);