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        //luckstar 10 background-colors:
        public enum enumBackgroundColor {
            Entry = 0xEC39D8, //視窗, Entry, 適合輸入作業
            Red = 0xFFB7DD, //紅, red
            Orange = 0xFFDDAA, //橙, Orange
            Yellow = 0xFFFFBB, // 黃,   yellow
            Green = 0xCCFF99, //綠,   green
            Blue = 0xBBFFEE, //藍,   blue
            Indigo = 0xCCDDFF, //靛,   Indigo
            Purple = 0xF0BBFF, //紫,   purple
            Black = 0x000000, //黑,   black
            White = 0xFFFFFF, //白,   white, 適合列印
        };

        // sample code to get enum
            foreach (string s1 in Enum.GetNames(typeof(enumBackgroundColor)))
            {
                enumBackgroundColor iColor;
                string sHex;
                Console.Write(s1);
                Console.Write("=");
                iColor = (enumBackgroundColor) Enum.Parse(typeof(enumBackgroundColor), s1);
                sHex = string.Format("{0:X}", iColor);
                Console.WriteLine(sHex + ", int=" + iColor);
            }


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code1: Enum.Parse


using System;

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 s in Enum.GetNames(typeof(Colors)))
            Console.WriteLine(s);

        Console.WriteLine();

        Colors myOrange = (Colors)Enum.Parse(typeof(Colors), "Red, Yellow");
        Console.WriteLine("The myOrange value has the combined entries of {0}", myOrange);
    }
}

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code2:

// keyword_enum.cs
// enum initialization:
using System;
public class EnumTest 
{
    enum Days {Sat=1, Sun, Mon, Tue, Wed, Thu, Fri};

    static void Main() 
    {
        int x = (int)Days.Sun;
        int y = (int)Days.Fri;
        Console.WriteLine("Sun = {0}", x);
        Console.WriteLine("Fri = {0}", y);
    }
}

output:
Sun = 2
Fri = 7


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code3:

// keyword_enum2.cs
// Using long enumerators
using System;
public class EnumTest 
{
    enum Range :long {Max = 2147483648L, Min = 255L};
    static void Main() 
    {
        long x = (long)Range.Max;
        long y = (long)Range.Min;
        Console.WriteLine("Max = {0}", x);
        Console.WriteLine("Min = {0}", y);
    }
}

output:
Max = 2147483648
Min = 255


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code4:

// enumFlags.cs
// Using the FlagsAttribute on enumerations.
using System;

[Flags]
public enum CarOptions
{
    SunRoof = 0x01,
    Spoiler = 0x02,
    FogLights = 0x04,
    TintedWindows = 0x08,
}

class FlagTest
{
    static void Main()
    {
        CarOptions options = CarOptions.SunRoof | CarOptions.FogLights;
        Console.WriteLine(options);
        Console.WriteLine((int)options);
    }
}


output:
SunRoof, FogLights
5

Notice that if you remove the initializer from Sat=1, the result will be:
Sun = 1
Fri = 6

Notice that if you remove FlagsAttribute, the example will output the following:
5
5