using System;

using System.Linq;

using System.Text;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        Workflow workflow = new Workflow();

        Console.WriteLine(workflow.GetStepStatus());

        string[] stepNames = new [] { "Two", "Four" };

        workflow.BlockSteps(stepNames);

        Console.WriteLine(workflow.GetStepStatus());

    }

}

​

public class Workflow

{

    private IEnumerable<Step> steps = new List<Step>

    {

        new Step("One"),

        new Step("Two"),

        new Step("Three"),

        new Step("Four")

    };

    public void BlockSteps(string[] stepNames)

    {

        foreach(Step step in steps.Where(s => stepNames.Contains(s.Name)))

        {

            step.IsBlocked = true;

        }

    }

    public string GetStepStatus()

    {

        var sb = new StringBuilder();

        foreach(Step step in steps)

        {

            sb.AppendLine($"{step.Name} {step.IsBlocked}");

        }

        return sb.ToString();

    }

}

​

public class Step

{

    public Step(string name)

    {

        Name = name;

    }

    public string Name { get; set; }

    public Guid Id { get; set; } = Guid.NewGuid();

    public bool IsBlocked { get; set; }

}

​