// https://www.dotnetcurry.com/dotnet/1092/dotnet-design-patterns

using System;

​

public class MailManager

{

    public MailManager To(string address)

    {

        Console.WriteLine("To: " + address);

        return this;

    }

​

    public MailManager From(string address)

    {

        Console.WriteLine("From: " + address);

        return this;

    }

​

    public MailManager Subject(string subject)

    {

        Console.WriteLine("Subject: " + subject);

        return this;

    }

​

    public MailManager Body(string body)

    {

        Console.WriteLine("Body: " + body);

        return this;

    }

​

    public void Send()

    {

        Console.WriteLine("Sent!");

    }

}

​

/*

public class MailManager

{

    public void To(string address)

    {

        Console.WriteLine("To: " + address);

    }

​

    public void From(string address)

    {

        Console.WriteLine("From: " + address);

    }

​

    public void Subject(string subject)

    {

        Console.WriteLine("Subject: " + subject);

    }

​

    public void Body(string body)

    {

        Console.WriteLine("Body: " + body);

    }

​

    public void Send()

    {

        Console.WriteLine("Sent!");

    }

}

*/

public class Program

{

    public static void Main(string[] args)

    {

        /*

        var mailManager = new MailManager();

        mailManager.From("alan@developer.com");

        mailManager.To("jonsmith@developer.com");

        mailManager.Subject("Code sample");

        mailManager.Body("This is an the email body!");

        mailManager.Send();

        */

        new MailManager().From("alan@developer.com").To("jonsmith@developer.com").Subject("Code sample").Body("This is an the email body!").Send();

    }

}