枚举问题 请大侠指点

using System;
using System.Collections.Generic;
using System.Text;
namespace 枚举方法
{
   
    public class ParseTest
    {
        [FlagsAttribute]
        enum Colors { Red = 1, Green = 2, Blue = 4, Yellow = 8 };
        public static void Main()
        {
            Console.WriteLine("The entries of the Colors Enum are:");
            foreach (string colorName in Enum.GetNames(typeof(Colors)))
            {
                Console.WriteLine("{0}={1}", colorName,
                                             Convert.ToInt32(Enum.Parse(typeof(Colors), colorName)));
            }
            Console.WriteLine();
            Colors myOrange = (Colors)Enum.Parse(typeof(Colors), "Red, Yellow");
            Console.WriteLine("The myOrange value {1} has the combined entries of {0}",myOrange, Convert.ToInt64(myOrange));
        }
    }
}
这个程序中 Console.WriteLine("The myOrange value {1} has the combined entries of {0}",myOrange, Convert.ToInt64(myOrange));这一句的运行的结果为什么是
The myOrange value 9 has the combined entries of red,Yellow?这个9和Red,Yellow是怎么出来的，“Red,Yellow”中“”有什么特殊作用吗？

我是这样理解的,,...9是:你的YELLOW=8可能往后移了一位..还有你myOrange = (Colors)Enum.Parse(typeof(Colors), "Red, Yellow");
里面的""是字符应该只会显示RED.YELLOW吧,,..