using System;

using System.Reflection;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var poco = new POCO();

        poco.Prop1 = "a";

        poco.Prop2 = "B";

​

​

        poco.SaveState();

​

        poco.Prop2 = "b";

​

        Console.WriteLine(poco.HasChanged("Prop1"));

        Console.WriteLine(poco.HasChanged("Prop2"));

    }

}

​

public class POCO : HasChangedBase

{

    public string Prop1 {get;set;}

    public string Prop2 {get;set;}

}

​

public class HasChangedBase 

{

    private class PropertyState 

    {

        public PropertyInfo Property {get;set;}

        public Object Value {get;set;}

    }

​

    private Dictionary<string, PropertyState> propertyStore;

    public void SaveState() 

    {

        propertyStore = this

            .GetType()

            .GetProperties()

            .ToDictionary(p=>p.Name, p=>new PropertyState{Property = p, Value = p.GetValue(this)});

    }

    public bool HasChanged(string propertyName) 

    {

        return propertyStore != null 

            && propertyStore.ContainsKey(propertyName) 

            && propertyStore[propertyName].Value != propertyStore[propertyName].Property.GetValue(this);

    }

}