Решение с использованием ООП

using System;
using System.Collections.Generic;
using System.Text;
using System.IO;

namespace source
{
    class Program
    {
        public static void Main(string[] args)
        {
            var objCommand = new List<SetName>
            {
                new SetName("SetName"),
                new DisplayName("DisplayName"),
                new SetColor("SetColor"),
                new DicplayBoxWithName("DicplayBoxWithName")
            };

            while(true)
            {
                Console.Clear();
                Console.WriteLine("Введите команду:");
                GetCommand(objCommand);
                CommandExecution(Console.ReadLine(), objCommand);
                Console.ReadLine();
            }
        }

        static void GetCommand(List<SetName> objComm)
        {
            for(int i = 0; i < objComm.Count; i++)
            {
                Console.WriteLine(objComm[i].NameCommand);
            }
            Console.WriteLine(Environment.NewLine);
        }

        static void CommandExecution(string command, List<SetName> objcomm)
        {
            foreach(var obj in objcomm)
            {
                if(obj.NameCommand == command)
                {
                    obj.Action();
                    return;
                }
            }
            Console.WriteLine("Такой команды нет.");
        }
    }

    class SetName
    {
        public SetName(string namecommand)
        {
            NameCommand = namecommand;
            Name = "Иван";
        }
        public string NameCommand{get;set;}
        public string Name{get;set;}
        public virtual void Action()
        {
            Console.WriteLine("Введите имя:");
            this.Name = Console.ReadLine();
        }
    }

    class DisplayName: SetName
    {
        public DisplayName(string namecommand): base(namecommand)
        {
            base.NameCommand = namecommand;
        }
        public int CountName{get;set;}
        public override void Action()
        {
            Console.WriteLine("Введите целое число:");
            this.CountName = InputNumber();
            for(int i = 0; i < this.CountName; i++)
            {
                Console.WriteLine(Name);
            }
        }

        static public int InputNumber()
        {
            int userNumber;
            while(int.TryParse(Console.ReadLine(), out userNumber) == false)
            {
                Console.WriteLine("Ошибка ввода! Попробуйте еще раз.");
            }
            return userNumber;
        }
    }

    class SetColor: SetName
    {
        public SetColor(string namecommand): base(namecommand)
        {
            base.NameCommand = namecommand;
        }
        public override void Action()
        {
            Console.WriteLine("Выберите цифру цвета:");
            var colors = Enum.GetValues(typeof(ConsoleColor));
            for(int i = 0; i < colors.Length; i++)
            {
                Console.WriteLine("Цвет - {0}; Команда - {1}", colors.GetValue(i), i);
            }
            Console.WriteLine("Цвет фона:");
            Console.BackgroundColor = (ConsoleColor)colors.GetValue(DisplayName.InputNumber());

            Console.WriteLine("Цвет текста:");
            Console.ForegroundColor = (ConsoleColor)colors.GetValue(DisplayName.InputNumber());
        }
    }

    class DicplayBoxWithName: SetName
    {
        public DicplayBoxWithName(string namecommand): base(namecommand)
        {
            base.NameCommand = namecommand;
        }
        public override void Action()
        {
            Console.WriteLine("Установите размер стороны квадрата: ");
            int sizeSquare = DisplayName.InputNumber();
            for(int i = 0; i < sizeSquare; i++)
            {
                if(i == 0 || i == sizeSquare-1)
                {
                    Console.WriteLine(new String('#', sizeSquare));
                }
                else
                {
                    Char[] mass = Name.ToCharArray();
                    if(sizeSquare/2 == i)
                    {
                        Console.WriteLine("#" + new String(mass, 0, mass.Length) + new String(' ', sizeSquare-2-mass.Length) + "#");
                    }
                    else
                    {
                        Console.WriteLine("#" + new String(' ', sizeSquare - 2) + "#");
                    }

                }
            }
        }
    }
}