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1 using System;
2 using System.Collections;
3 using System.Configuration;
4 using System.Data;
5 using System.Linq;
6 using System.Web;
7 using System.Web.Security;
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Observer.cs
using System;
using System.Text;
using System.Collections.Generic;
namespace Observer
{
public interface ISubject
{
void RegisterObserver(IOvserver o);
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