using System;

using System.Linq;

​

    public class Assembly

    {

        public int Level { get; set; }

        public string Parent { get; set; }

        public string Component { get; set; }

        public bool Visited{get;set;}

    }

public class Program

{

    public static void Main()

    {

                Assembly[] assemblies = { 

            new Assembly { Level=1, Parent="L010057501U", Component="231-100-002" },

            new Assembly { Level=1, Parent="L010057501U", Component="307-355-022" },

            new Assembly { Level=2, Parent="307-355-022", Component="307-355-058" },

            new Assembly { Level=2, Parent="307-355-022", Component="307-355-059" },

            new Assembly { Level=3, Parent="307-355-058", Component="355-100-008" },

            new Assembly { Level=3, Parent="307-355-059", Component="355-200-005" },

            new Assembly { Level=3, Parent="307-355-059", Component="357-100-002" },

            new Assembly { Level=3, Parent="307-355-058", Component="357-200-002" }

        };

        DisplayAssemblies(assemblies);

​

    }

​

    private static void DisplayAssemblies(Assembly[] data)

    {

        // order the data to be sorted by levels

        var levels=data.OrderBy(t=>t.Level);

        foreach(var level in levels)

            if(!level.Visited)

                DisplayLevel(level,data);

    }

    private static void DisplayLevel(Assembly level, Assembly[] data)

    {

        var childs=data.Where(t=>t.Parent==level.Component).ToArray();

        Console.WriteLine("{0} - {1} - {2}", level.Level, level.Parent, level.Component);

        level.Visited=true;

        foreach(var child in childs)

        {       

            DisplayLevel(child,data);

        }

    }

}