How to implement INotifyPropertyChanged
<p>I need help implementing INotifyPropertyChanged in my own data structure class.  This is for a class assignment, but implementing INotifyPropertyChanged is an addition that I am doing above and beyond what the rubric requires.</p>

<p>I have a class named 'BusinessRules' that uses a SortedDictionary to store objects of 'Employee' type.  I have a DataGridView showing all of my employees, and I want to use my BusinessRules class object as the DataSource for my DataGridView.  The BusinessRules container is required for the assignment.  I have tried to implement INotifyPropertyChanged in this class, with no success.</p>

<p>The DataSource that I have working is a BindingList.  Presently, I am using that BindingList as a 'sidecar' container and setting that as my DataSource.  Every change that I make to my BusinessRules class object is mirrored to my BindingList class object.  But this is obviously sloppy programming, and I want to do better.</p>

<p>I have tried to implement INotifyPropertyChanged in BusinessRules, but when I set my instantiated BusinessRules object as the DataSource, the DataGridView shows nothing.  What I suspect the problem to be is with the NotifyPropertyChanged() method.  I do not know what to pass to this, nor what to do with what is passed in.  Most examples deal with changing a name, but I am more concerned when a new object is added to the SortedDictionary.</p>

<pre><code>    private void NotifyPropertyChanged( Employee emp )
    {
        PropertyChanged?.Invoke( this, new PropertyChangedEventArgs( emp.FirstName ) );
    }
</code></pre>

<p>What do I need to change in order to get this working?  Will you explain why my attempt is not working?</p>

<p>I am notoriously bad about forming my questions on StackOverflow.  This is not intentional.  Please, let me know what other information you require, and I will provide it as quickly as I can.</p>

<p><a href="https://gist.github.com/AdamJHowell/3bfbbb48972825517ebc0dec367b462f" rel="nofollow">Here is a link to my BusinessRules source code</a>.</p>