using MihaZupan.TelegramStorageParser;
using MihaZupan.TelegramStorageParser.TelegramDesktop;

string tDataPath = Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData) + "/Telegram Desktop/tdata";
ParsingState parsingState = LocalStorage.TryParse(tDataPath, out LocalStorage localStorage);

if (parsingState == ParsingState.Success)
{
    Console.WriteLine("Phone number: " + localStorage.LoggedPhoneNumber ?? "not present");
}