Check that integer type belongs to enum member

Question

I want to check that some integer type belongs to (an) enumeration member.

For Example,

public enum Enum1
{
    member1 = 4,

    member2 = 5,

    m         


        

Answer 1

Be careful this won't work if you have an enum for 3 (Apples and Pears) the methods above won't detect it as valid.

[Flags]
public enum Fruit
{ 

    Apples=1,

    Pears=2,

    Oranges =4,

}