using System;

using System.Collections.Generic;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        var x = new MyClass();

        Console.WriteLine(x.Changed());  //false

        x.MyProp1 = 12;

        Console.WriteLine(x.Changed());  //false, because we haven't started tracking changes yet

        x.TrackChanged();

​

        x.MyProp1 = 0;

​

        Console.WriteLine(x.Changed());  //true

        x.MyProp1 = 12;

        Console.WriteLine(x.Changed());  //false

    }

}

​

public class MyClass{   

    public int MyProp1 {get; set;}

    public string MyProp2 {get; set;}

    public decimal MyProp3 {get; set;}

    private string _Snapshot {get; set;}

    private bool _TrackingChanges {get; set;}

    public void TrackChanged() {

        this._TrackingChanges = true;

        this._Snapshot = this.GetSnapshot();

    }

    private string GetSnapshot() {

        return $"{MyProp1},{MyProp2},{MyProp3}";

    }

    public bool Changed(){

        return this._TrackingChanges && !this.GetSnapshot().Equals(this._Snapshot, StringComparison.InvariantCulture);

    }

}