using System;

using System.Collections.Generic;

​

​

​

    public class CompanyAEmployee

    {

        public string FullName { get; set; }

        public string Title { get; set; }

        public List<CompanyAEmployee> Children { get; set; }

     }

​

    public class CompanyBEmployee

    {

        public string Name { get; set; }

        public string PositionName { get; set; }

        public List<CompanyBEmployee> Children { get; set; }

    }

    public static class ClassConverterExtensions

    {

        public static CompanyBEmployee ToCompanyBEmployee(this CompanyAEmployee that)

        {

            var result = new CompanyBEmployee();

            result.Name = that.FullName;

            result.PositionName = that.Title;

            if(that.Children == null)

            {

                return result;

            }

            result.Children = new List<CompanyBEmployee>();

            foreach(var item in that.Children)

            {

                result.Children.Add(item.ToCompanyBEmployee());

            }

            return result;

        }

    }

​

public static class Program

{

    public static void Main()

    {

        Console.WriteLine("Start!");

        var item = new CompanyAEmployee();

        var converted = item.ToCompanyBEmployee();

        Console.WriteLine("End!");

    }

}