using System;

using System.Collections.Generic;

​

public class Workflow

{

    private readonly List<Action> _steps;

​

    private Workflow(List<Action> steps)

    {

        _steps = steps;

    }

​

    public void Run()

    {

        foreach (var step in _steps)

        {

            step();

        }

    }

​

    public class Builder

    {

        private readonly List<Action> _steps = new List<Action>();

​

        public Builder Step(Action action)

        {

            _steps.Add(action);

            return this;

        }

​

        public Workflow Build()

        {

            return new Workflow(_steps);

        }

    }

}

​

​

public class Program

{

    public static void Main()

    {

        var workflow = new Workflow.Builder()

        .Step(() => Console.WriteLine("Step 1"))

        .Step(() => Console.WriteLine("Step 2"))

        .Build();

​

        workflow.Run();

    }

}