EMail OTP System using C#.NET

EmailSystem.cs

using System.Net.Mail;
using System.Net;

namespace ConsoleAppTest;

class EmailSystem
{
    private readonly string smtpHost;
    private readonly int smtpPort;
    private readonly string smtpUser;
    private readonly string smtpPass;
    private readonly bool enableSsl;

    public EmailSystem(string host, int port, string user, string pass, bool ssl = true)
    {
        smtpHost = host;
        smtpPort = port;
        smtpUser = user;
        smtpPass = pass;
        enableSsl = ssl;
    }

    public async Task<bool> SendEmailAsync(string toEmail, string subject, string body, bool isHtml = true)
    {
        try
        {
            using (SmtpClient smtp = new SmtpClient(smtpHost, smtpPort))
            {
                smtp.Credentials = new NetworkCredential(smtpUser, smtpPass);
                smtp.EnableSsl = enableSsl;

                MailMessage mail = new MailMessage
                {
                    From = new MailAddress(smtpUser),
                    Subject = subject,
                    Body = body,
                    IsBodyHtml = isHtml
                };
                mail.To.Add(toEmail);

                await smtp.SendMailAsync(mail);
                return true;
            }
        }
        catch (Exception ex)
        {
            Console.WriteLine($"Error sending email: {ex.Message}");
            return false;
        }
    }
}

Program.cs

using ConsoleAppTest;

Console.WriteLine("Welcome to OTP Program");

Random R = new();
int Number = R.Next(100000,999999);

EmailSystem emailSystem = new("smtp.gmail.com", 587, "SendFromGMailID", "YourPasswordORKey");

var flag = await emailSystem.SendEmailAsync("SendToEmail", "OTP", $"Your OTP is {Number}");

Console.WriteLine("Please enter your OTP to login");
int userOTP = int.Parse(Console.ReadLine());
if(userOTP == Number)
{
    Console.WriteLine("Login Successful");
}
else
{
    Console.WriteLine("invalid OTP");
}