http://blog.nilsjonsson.com/post/632748350/never-declare-another-csharp-delegate-again

MintonsPlayhouse.cs

var mintonsPlayhouseCirca1941 = new Nightclub();
mintonsPlayhouseCirca1941.Bouncer = delegate(person)
{
    // Welcome, paying customers!
    var customer = person as ICustomer;
    if ((customer != null) && (customer.CashOnHand > 0)) return true;
    
    // Feel free to sit in ... if you can play, that is.
    var musician = person as IMusician;
    if ((musician != null) &&
        musician.CanPlay(Standards.Perdido.Transpose(Key.CSharpMajor)))
    {
        return true;
    }
    
    // "Get outta here, and get me some money, too."
    // http://en.wikipedia.org/wiki/Why_Don't_You_Do_Right%3F
    return false;
};
mintonsPlayhouseCirca1941.Enter(dizzyGillespie);
// => true
mintonsPlayhouseCirca1941.Enter(woodyGuthrie);
// => false
mintonsPlayhouseCirca1941.Enter(daddyWarbucks);
// => true
mintonsPlayhouseCirca1941.Enter(pennilessHobo);
// => false
System.Console.WriteLine(mintonsPlayhouseCirca1941.Occupants);
// => new Person[] { dizzyGillespie, daddyWarbucks }

Nightclub.cs

using System.Collections.Generic;

class Nightclub
{
    public delegate bool IsAllowed(Person person);
    
    private readonly List<Person> occupants = new List<Person>();
    
    public Nightclub()
    {
        occupants = new List<Person>();
    }
    
    public IsAllowed Bouncer { get; set; }
    
    public Person[] Occupants
    {
        get { return occupants.ToArray(); }
    }
    
    public bool Enter(Person person)
    {
        if ((Bouncer != null) && !Bouncer(person)) return false;
        occupants.Add(person);
        return true;
    }
}