using System;
using System.EnterpriseServices;
using System.Reflection;

[assembly: ApplicationName("Bank")]
[assembly: ApplicationActivation(ActivationOption.Server)]
[assembly: ApplicationAccessControl(true)]

[assembly: AssemblyKeyFile("key.snk")]
[assembly: AssemblyVersion("1.0.0.0")]

[assembly: SecurityRole("Everyone", SetEveryoneAccess = true)]
[assembly: SecurityRole("Teller")]
[assembly: SecurityRole("Customer")]
[assembly: SecurityRole("Manager")]

public interface IAccount
{
   float Read();
   void Withdraw(float x);
   void Deposit(float x);
}

[ComponentAccessControl(true)]
[SecurityRole("Manager")]
public class Account : ServicedComponent, IAccount
{
   float account = 1000;

   [SecurityRole("Customer")]
   [SecurityRole("Teller")]
   public float Read()
   {
      return account;
   }
   [SecurityRole("Customer")]
   public void Withdraw(float x)
   {
      account -= x;
   }
   [SecurityRole("Everyone")]
   public void Deposit(float x)
   {
      account += x;
   }
}