I want to display this code on c# but it dosen't work | C# Online Compiler

I want to display this code on c# but it dosen't work by Daniel Vogel

using System;
namespace CGS
{
	class Program
	{
		struct Artist
		{
			public string ID;
			public string fname;
			public string Iname;
		}
		struct Curator
		{
			public string ID;
			public string fname;
			public string Iname;
		}
		struct Artpiece
		{
			public string ID;
			public string title;
			public string date;
			public string IDartist;
			public string IDcurator;
			public double estimed;
			public double price;
			public char status;
		}
		static Artist[] MyArtists = new Artist[5];
		static Curator[] MyCurators = new Curator[3];
		static Artpiece[] MyArtpiece = new Artpiece[10];
		static int artistcount = 0;
		static int Curatorcount = 0;
		static int artpiece = 0;
		static void Main(string[] arg)
		{
			int choice = 0;
			{
				choice = Menu();
				switch (choice)
				{
					case 1:
						{
							Console.WriteLine(" AddArtist ");
							break;
						}
					case 2:
						{
							Console.WriteLine(" AddCurator ");
							break;
						}
					case 3:
						{
							Console.WriteLine(" AddArtpiece ");
							break;
						}
					case 4:
						{
							Console.WriteLine(" Displayallartpieces ");
							break;
						}
					case 5:
						{
							Console.WriteLine(" Findartcode ");
							break;
						}
					case 6:
						{
							Console.WriteLine(" deleteartpiece ");
							break;
						}
					case 7:
						{
							Console.WriteLine(" quitapplication ");
							break;
						}
				}
				if (choice == 7)
					break;
				else
					Console.WriteLine(Menu());
			}
		}
		static int Menu()
		{
			Console.WriteLine("1. Add an Artist");
			Console.WriteLine("2. Add a Curator");
			Console.WriteLine("3. Add an Art piece");
			Console.WriteLine("4. Display all art pieces");
			Console.WriteLine("5. find an art piece by code");
			Console.WriteLine("6. Delete an art piece");
			Console.WriteLine("7. Quit the application");
			string choice = Console.ReadLine();
			int choice = 0;
			return choice;
		}
		static void AddArtist()
		{
			Console.WriteLine("enter ID");
			String ID = Console.ReadLine();
			Console.WriteLine("enter firstname");
			string fname = Console.ReadLine();
			Console.WriteLine("enter last name");
			string lname = Console.ReadLine();
			MyArtists[artistcount].ID = ID;
			MyArtists[artistcount].fname = fname;
			MyArtists[artistcount].Iname = lname;
			artistcount++;
		}
		static void AddCurator()
		{
			Console.WriteLine("enter ID");
			string ID = Console.ReadLine();
			Console.WriteLine("enter firstname");
			string fname = Console.ReadLine();
			Console.WriteLine("enter lastname");
			string lname = Console.ReadLine();
		}
		static void AddArtpiece()
		{
			Console.WriteLine("enter ID");
			string ID = Console.ReadLine();
			Console.WriteLine("enter title");
			string title = Console.ReadLine();
			Console.WriteLine("enter date");
			string date = Console.ReadLine();
			Console.WriteLine("enter Artist's ID");
			string IDArtist = Console.ReadLine();
			Console.WriteLine("enter Curator's ID");
			string IDCurator = Console.ReadLine();
			Console.WriteLine("enter estimed");
			double estimed = Convert.ToDouble(Console.ReadLine());
			Console.WriteLine("enter price");
			double price = Convert.ToDouble(Console.ReadLine());
			Console.WriteLine("enter status");
			char status = Convert.ToChar(Console.ReadLine());
			MyArtpiece[artistcount].ID = ID;
			MyArtpiece[artistcount].title = title;
			MyArtpiece[artistcount].date = date;
			MyArtpiece[artistcount].IDArtist = IDArtist;
			MyArtpiece[artistcount].estimed = estimed;
			MyArtpiece[artistcount].price = price;
			MyArtpiece[artistcount].status = status;
			artistcount++;
		}
		static void Displayallartpieces()
		{
			string str = "Display of All the Art pieces";
			foreach (Artpiece art in MyArtpiece)
			{
				str += art.ID + "," + art.title + "," + art.date + "\n";
			}
			Console.WriteLine(str);
			Console.ReadLine();
		}
		static void Findartcode()
		{
			Console.WriteLine("Please input Artpiece code");
			bool found = false;
			string ID = Console.ReadLine();
			foreach (Artpiece art in MyArtpiece)
			{
				if (art.ID == id)
				{
					Console.WriteLine(art.title + " / ");
					found = true;
					break;
				}
			}
			if (found == false)
			{
				Console.WriteLine("Please input Artpiece code");
			}
		}
		static void deleteartpiece()
		{
			Console.WriteLine("Please input Artpiece ID");
			string id = Console.ReadLine();
			int i = 0;
			int j = 1;
			bool found = false;
			for (i = 0; i < MyArtpiece.Length; i++)
			{
				if (MyArtpiece[i].ID == id)
				{
					for (j = i; j < MyArtpiece.Length - 1; j++)
					{
						MyArtpiece[j] = MyArtpiece[j + 1];
						found = true;
						break;
					}
				}
				MyArtpiece[MyArtpiece.Length - 1] = new Artpiece();
				Console.WriteLine("Art piece deleted");
			}
			//if (found == true);
			// // break;
			if (found == false)
			{
				Console.WriteLine("ID not found");
				Console.ReadLine();
			}
		}
		static void quitapplication()
		{
			Console.WriteLine("Session closed");
			Console.ReadLine();
		}
	}
}

 
using System;
namespace CGS
{
    class Program
    {
        struct Artist
        {
            public string ID;
            public string fname;
            public string Iname;
        }
        struct Curator
        {
            public string ID;
            public string fname;
            public string Iname;
        }
        struct Artpiece
        {
            public string ID;
            public string title;
            public string date;
            public string IDartist;
            public string IDcurator;
            public double estimed;
            public double price;
            public char status;
        }
        static Artist[] MyArtists = new Artist[5];
        static Curator[] MyCurators = new Curator[3];
        static Artpiece[] MyArtpiece = new Artpiece[10];
        static int artistcount = 0;
        static int Curatorcount = 0;
        static int artpiece = 0;
        static void Main(string[] arg)
        {
            int choice = 0;
            {
                choice = Menu();
                switch (choice)
                {
                    case 1:
                        {
                            Console.WriteLine(" AddArtist ");
                            break;
                        }
                    case 2:
                        {
                            Console.WriteLine(" AddCurator ");
                            break;
                        }
                    case 3:
                        {
                            Console.WriteLine(" AddArtpiece ");
                            break;
                        }
                    case 4:
                        {
                            Console.WriteLine(" Displayallartpieces ");
                            break;
                        }
                    case 5:
                        {
                            Console.WriteLine(" Findartcode ");
                            break;
                        }
                    case 6:
                        {
                            Console.WriteLine(" deleteartpiece ");
                            break;
                        }
                    case 7:
                        {
                            Console.WriteLine(" quitapplication ");
                            break;
                        }
                }
                if (choice == 7)
                    break;
                else
                    Console.WriteLine(Menu());
            }
        }
        static int Menu()
        {
            Console.WriteLine("1. Add an Artist");
            Console.WriteLine("2. Add a Curator");
            Console.WriteLine("3. Add an Art piece");
            Console.WriteLine("4. Display all art pieces");
            Console.WriteLine("5. find an art piece by code");
            Console.WriteLine("6. Delete an art piece");
            Console.WriteLine("7. Quit the application");
            string choice = Console.ReadLine();
            int choice = 0;
            return choice;
        }
        static void AddArtist()
        {
            Console.WriteLine("enter ID");
            String ID = Console.ReadLine();
            Console.WriteLine("enter firstname");
            string fname = Console.ReadLine();
            Console.WriteLine("enter last name");
            string lname = Console.ReadLine();
            MyArtists[artistcount].ID = ID;
            MyArtists[artistcount].fname = fname;
            MyArtists[artistcount].Iname = lname;
            artistcount++;
        }
        static void AddCurator()
        {
            Console.WriteLine("enter ID");
            string ID = Console.ReadLine();
            Console.WriteLine("enter firstname");
            string fname = Console.ReadLine();
            Console.WriteLine("enter lastname");
            string lname = Console.ReadLine();
        }
        static void AddArtpiece()
        {
            Console.WriteLine("enter ID");
            string ID = Console.ReadLine();
            Console.WriteLine("enter title");
            string title = Console.ReadLine();
            Console.WriteLine("enter date");
            string date = Console.ReadLine();
            Console.WriteLine("enter Artist's ID");
            string IDArtist = Console.ReadLine();
            Console.WriteLine("enter Curator's ID");
            string IDCurator = Console.ReadLine();
            Console.WriteLine("enter estimed");
            double estimed = Convert.ToDouble(Console.ReadLine());
            Console.WriteLine("enter price");
            double price = Convert.ToDouble(Console.ReadLine());
            Console.WriteLine("enter status");
            char status = Convert.ToChar(Console.ReadLine());
            MyArtpiece[artistcount].ID = ID;
            MyArtpiece[artistcount].title = title;
            MyArtpiece[artistcount].date = date;
            MyArtpiece[artistcount].IDArtist = IDArtist;
            MyArtpiece[artistcount].estimed = estimed;
            MyArtpiece[artistcount].price = price;
            MyArtpiece[artistcount].status = status;
            artistcount++;
        }
        static void Displayallartpieces()
        {
            string str = "Display of All the Art pieces";
            foreach (Artpiece art in MyArtpiece)
            {
                str += art.ID + "," + art.title + "," + art.date + "\n";
            }
            Console.WriteLine(str);
            Console.ReadLine();
        }
        static void Findartcode()
        {
            Console.WriteLine("Please input Artpiece code");
            bool found = false;
            string ID = Console.ReadLine();
            foreach (Artpiece art in MyArtpiece)
            {
                if (art.ID == id)
                {
                    Console.WriteLine(art.title + " / ");
                    found = true;
                    break;
                }
            }
            if (found == false)
            {
                Console.WriteLine("Please input Artpiece code");
            }
        }
        static void deleteartpiece()
        {
            Console.WriteLine("Please input Artpiece ID");
            string id = Console.ReadLine();
            int i = 0;
            int j = 1;
            bool found = false;
            for (i = 0; i < MyArtpiece.Length; i++)
            {
                if (MyArtpiece[i].ID == id)
                {
                    for (j = i; j < MyArtpiece.Length - 1; j++)
                    {
                        MyArtpiece[j] = MyArtpiece[j + 1];
                        found = true;
                        break;
                    }
                }
                MyArtpiece[MyArtpiece.Length - 1] = new Artpiece();
                Console.WriteLine("Art piece deleted");
            }
            //if (found == true);
            // // break;
            if (found == false)
            {
                Console.WriteLine("ID not found");
                Console.ReadLine();
            }
        }
        static void quitapplication()
        {
            Console.WriteLine("Session closed");
            Console.ReadLine();
        }
    }
}

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