Chain Of Reponsibility Design Pattern's implementation

ChainOfResponsibility.cs

// helper classes

public interface IRequest { }

public class RequestInfo 
{
    public string CreateBy { get; set; }
    public string UpdateBy { get; set; }
    public DateTime CreateDate { get; set; }
    public DateTime UpdateDate { get; set; }
}

public class BaseRequest
    : RequestInfo,IRequest
{
    public State State { get; set; }
}

public class LoanRequest
    : BaseRequest 
{
    public decimal Amount { get; set; }
}

public enum State 
{
    None,     
    New,
    WaitingApproval,
    ApprovedApproval,  
    RejectedApproval,       
    WaitingCancelledApproval,  
    ApprovedCancelledApproval,    
    RejectedCancelledApproval,
    Completed
}

// handler
public abstract class BaseRequestHandler<TRequest>
    where TRequest : BaseRequest
{
    public BaseRequestHandler<TRequest> Successor
    {
        protected get;
        set;
    }

    public void ExecuteRequest(TRequest request)
    {
        Execute(request);

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

    protected abstract void Execute(TRequest request);
}

// concrete handler
public class FirstApproverRequestHandler
    : BaseRequestHandler<LoanRequest>
{
    protected override void Execute(LoanRequest request)
    {
        Console.WriteLine("Execute : FirstApproverRequestHandler");
    }
}

// concrete handler
public class SecondApproverRequestHandler
    : BaseRequestHandler<LoanRequest>
{
    protected override void Execute(LoanRequest request)
    {
        Console.WriteLine("Execute : SecondApproverRequestHandler");
    }
}

// concrete handler
public class ManagerApproverRequestHandler
    : BaseRequestHandler<LoanRequest>
{
    protected override void Execute(LoanRequest request)
    {
        Console.WriteLine("Execute : ManagerApproverRequestHandler");
    }
}

// using 
class Program
{
    static void Main(string[] args)
    {
        BaseRequestHandler<LoanRequest> handler = new FirstApproverRequestHandler();
        BaseRequestHandler<LoanRequest> handler1 = new SecondApproverRequestHandler();
        BaseRequestHandler<LoanRequest> handler2 = new ManagerApproverRequestHandler();

        // setup chain of responsibility
        handler.Successor = handler1;
        handler1.Successor = handler2;

        // request object
        LoanRequest request = new LoanRequest();
        request.State = State.ApprovedApproval;

        // handler -> request executer
        handler.ExecuteRequest(request);

        Console.ReadLine();
    }
}