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 ; 
//位或
Colors myColors = Colors.Red | Colors.Blue | Colors.Yellow;
//位与
Colors myColors = Colors.Red & Colors.Blue & Colors.Yellow;
//遍历 
foreach (string s in Enum.GetNames(typeof(Days)))
  Response.Write(s + "--" + Enum.Parse(typeof(Days), s).ToString());
//转换
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");

using System.ComponentModel; // 先添加该引用
enum Direction
{
    [Description("this means facing to UP (Negtive Y)")]
    UP = 1,
    [Description("this means facing to RIGHT (Positive X)")]
    RIGHT = 2,
    [Description("this means facing to DOWN (Positive Y)")]
    DOWN = 3,
    [Description("this means facing to LEFT (Negtive X)")]
    LEFT = 4
};

//使用如下方法来获得文字描述：
using System.Reflection;
using System.ComponentModel;
public static String GetEnumDesc(Direction e)
{
    FieldInfo EnumInfo = e.GetType().GetField(e.ToString());
    DescriptionAttribute[] EnumAttributes = (DescriptionAttribute[]) EnumInfo.
        GetCustomAttributes (typeof(DescriptionAttribute), false);
    if (EnumAttributes.Length > 0)
    {
        return EnumAttributes[0].Description;
    }
    return e.ToString();
}