وين الخطا في البرمجه

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

namespace ConsoleApplication1
{
class Program
{
enum fruits
{
orange,
apple,
banana
}
static void Main(string[] args)
{
switch(my choice)
{
case fruits.orange:
Console.WriteLine("you choose orange"); break;
}
}
}
}