How to maintain in an enum a list of enums

Question

Possible Duplicate:
Enum Flags Attribute

I've seen in Windows Forms that when you use a control which contains Anchor, you can set several enums at the same time.

I was trying to do that, but I haven't accomplished yet:

enum Foo
{
    A,
    B,
    C
}

Foo foo = A | B;   // here just receive the last one

Is possible doing this?

Answer 1

Use the Flags attribute.

Flags:

[Flags]
enum Days2
{
    None = 0x0,
    Sunday = 0x1,
    Monday = 0x2,
    Tuesday = 0x4,
    Wednesday = 0x8,
    Thursday = 0x10,
    Friday = 0x20,
    Saturday = 0x40
}

Answer 2

Yes this is the Flags attribute.

[Flags]
enum Foo 
{ 
  A = 1, 
  B = 2, 
  C = 4 
}


var foo = Foo.A | Foo.B;

More information here: What does the [Flags] Enum Attribute mean in C#?