Bag of marbles

marbles

using System;
using System.Collections.Generic;

// Say you have a bag of marbles. The marbles can 
// either be Yellow, Blue of Green. 
// Implement Add, Get operations from this bag
// The 'Get' method should be a weighted random operation 
// aka if there are more blue marbles then there should be 
// a higher probability of picking a blue on

namespace BagOfMarbles
{
    public class Program
    {
        public static void Main(string[] args)
        {
            Bag bag = new Bag();            
            
            addYellow(bag);
            addBlue(bag);
            addBlue(bag);
            addYellow(bag);
            addYellow(bag);
            addGreen(bag);
            addYellow(bag);
            addYellow(bag);
            addBlue(bag);
            addGreen(bag);
            
            pick(bag);
            pick(bag);
            pick(bag);  
        }
        
        static void addYellow(Bag bag) {
            Console.WriteLine("Adding Yellow");
            bag.Add(MARBLE_COLOR.YELLOW);
        }
        
        static void addBlue(Bag bag) {
            Console.WriteLine("Adding Blue");
            bag.Add(MARBLE_COLOR.BLUE);
        }
        
        static void addGreen(Bag bag) {
            Console.WriteLine("Adding Green");
            bag.Add(MARBLE_COLOR.GREEN);
        }
        
        static void pick(Bag bag) {
            var marble = bag.Get();
            String color = String.Empty;
            
            switch(marble) {
                case MARBLE_COLOR.YELLOW:
                    color = "yellow";
                break;
                
                case MARBLE_COLOR.BLUE:
                    color = "blue";
                break;
                
                case MARBLE_COLOR.GREEN:
                    color = "green";
                break;
            }
            
            Console.WriteLine("Picked up a {0} marble", color);
        }
    }
    
    enum MARBLE_COLOR {
        YELLOW,
        BLUE,
        GREEN
    };
    
    class Bag {
        
        List<MARBLE_COLOR> marbles;
        
        public Bag() {
            marbles = new List<MARBLE_COLOR>();
        }
        
        public void Add(MARBLE_COLOR marble) {
            marbles.Add(marble);
        }
        
        public MARBLE_COLOR Get() {
            Random randomGenerator = new Random();
            int index = randomGenerator.Next(marbles.Count);
            var marble = marbles[index];
            marbles.RemoveAt(index);
            
            return marble;
        }
    }
}