This code is from a Winform VS2012, works well.
But normally, If I want to use an event of a datagriedview or listview, I have to inform about the event and than the eventhandle procedure is expected, like within the first example.
But if it comes to INotifyPropertyChanged, none of it is needed. I cant see, neither understand why. I searchd around, even considering that INotify is an interface, but finally havnt found any explication.

First example has a code from Winform(Load event, button and datagridview.doubleclickevent)
Second example is class Customer, with PropertyChangedEventHandler
Code:
public partial class Form1 : Form
    {
        private BindingList<Customer> myBind = null;
        private Customer myCust= null; 

        public Form1()
        {
            myBind = new BindingList<Customer>();
            myCust = new Customer();
            myCust = myBind.AddNew();           

            InitializeComponent();

            this.dataGridView1.CellDoubleClick += dataGridView1_CellDoubleClick;
        }

        private void dataGridView1_CellDoubleClick(Object sender, DataGridViewCellEventArgs e)
        {
          //[...]
        }

        private void button1_Click(object sender, EventArgs e)
        {
            myCust.Company = "new Company";
            myCust.PosteCode = 1111456;          
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            myCust.Company = "AnyCompany";
            myCust.PosteCode = 123446;

            this.txtCompany.DataBindings.Add("Text", myBind, "Company");
            this.txtPostCode.DataBindings.Add("Text", myBind, "PosteCode");           
        }
    }

// Second Example class Customer with PropertyChangedEventHandler
Code:
public class Customer : INotifyPropertyChanged
        {
            public event PropertyChangedEventHandler PropertyChanged;

            private string mCompany; 
            private int  mPostCode;

            protected virtual void OnPropertyChanged(PropertyChangedEventArgs e)
            {
                if (PropertyChanged != null)
                    PropertyChanged(this, e);
            } 

            public string Company
            {
                get { return mCompany; }
                set
                {
                    mCompany = value;
                    OnPropertyChanged(new PropertyChangedEventArgs("Company"));
                }
            }

            public int PosteCode
            {
                get { return mPostCode; }
                set
                {
                    mPostCode = value;
                    OnPropertyChanged(new PropertyChangedEventArgs("PosteCode"));
                }
            }
        }