Chain Of Reponsibility Design Pattern's implementation classic example

ChainOfResponsibility_ClassicExample.cs

/// <summary>
/// The 'Handler' abstract class or interface
/// </summary>
public abstract class BaseHandler
{
    protected BaseHandler successor;
    public void SetSuccessor(BaseHandler successor)
    {
        this.successor = successor;
    }

    public abstract void ExecuteRequest(int request);
}

/// <summary>
/// The 'ConcreteHandler1' class
/// </summary>
public class ConcreteHandler1 
    : BaseHandler
{
    public override void ExecuteRequest(int request)
    {
        // Controls,operations

        if (successor != null)
            successor.ExecuteRequest(request);
    }
}

/// <summary>
/// The 'ConcreteHandler2' class
/// </summary>
public class ConcreteHandler2 
    : BaseHandler
{
    public override void ExecuteRequest(int request)
    {
        // Controls,operations

        if (successor != null)
            successor.ExecuteRequest(request);
    }
}

/// <summary>
/// The 'ConcreteHandler3' class
/// </summary>
public class ConcreteHandler3 
    : BaseHandler
{
    public override void ExecuteRequest(int request)
    {
        // Controls,operations

        if (successor != null)
            successor.ExecuteRequest(request);
    }
}

//using
class Program
{
    static void Main(string[] args)
    {
        // Setup Chain of Responsibility
        BaseHandler h1 = new ConcreteHandler1();
        BaseHandler h2 = new ConcreteHandler2();
        BaseHandler h3 = new ConcreteHandler3();
        h1.SetSuccessor(h2);
        h2.SetSuccessor(h3);


        h1.ExecuteRequest(10);
        h2.ExecuteRequest(21);
            
        Console.ReadLine();
    }
}