enum Days { Saturday=1, Sunday, Monday, Tuesday, Wednesday, Thursday, Friday };
enum Colors { Red = 1, Green = 2, Blue = 4, Yellow = 8 };

Colors myColors = Colors.Red;
string strColor=myColors.tostring();
int    IntColor=(int)myColors ; 

Colors myColors = Colors.Red | Colors.Blue | Colors.Yellow;

Colors myColors = Colors.Red & Colors.Blue & Colors.Yellow;

foreach (string s in Enum.GetNames(typeof(Days)))
  Response.Write(s + "--" + Enum.Parse(typeof(Days), s).ToString());

Colors mc=Colors Enum.Parse(typeof(Colors ), "red"); 
 if (System.Enum.IsDefined(typeof(Days), "Monday"))
   Days ds= (Days)Enum.Parse(typeof(Days), "Monday");

public enum NoticeType
    {
        Notice = 'A',
        LabRule = 'H',
        HotInformation = 'N',
        Column = 'C',
        All = '1',
        Null = '0'
     }
     //新建枚举类型
        NoticeType noticeType1 = NoticeType.Column;

        //把枚举类型转换为string d="Column"
        string d = noticeType1.ToString();

        //取得枚举类型的基数 dd='C'
        char dd = (char)noticeType1;

        //通过基数取得对应的枚举类型 noticeType2 = NoticeType.Notice
        //(NoticeType)'A';  两种方式都可以
        NoticeType noticeType2 = (NoticeType)Char.Parse("A"); 

    //通过名称取得枚举类型 noticeType3 = NoticeType.Notice
        NoticeType noticeType3 = (NoticeType)Enum.Parse(typeof(NoticeType), "Notice");