Data change not reflected when INotifyPropertyChanged is not implemented

first see the below code which works fine and when we update entity then change is automatically reflected in grid but the moment i comment thisINotifyPropertyChanged and all other code related to notify property change then grid is not getting the change.

so i like to know what kind of role is played by INotifyPropertyChanged ? howINotifyPropertyChanged communicate with grid to show or reflect the chnage? please help me to understand the communication betweengrid and INotifyPropertyChanged . thanks

namespace PatternSearch{publicpartialclassForm2:Form{publicForm2(){InitializeComponent();}privatevoid btnBindData_Click(object sender,EventArgs e){BindingList<Car> cars =newBindingList<Car>();

            cars.Add(newCar("Ford","Mustang",1967));
            cars.Add(newCar("Shelby AC","Cobra",1965));
            cars.Add(newCar("Chevrolet","Corvette Sting Ray",1965));

            dataGridView1.DataSource= cars;}privatevoid btnUpdate_Click(object sender,EventArgs e){if(dataGridView1.DataSource!=null){BindingList<Car> cars = dataGridView1.DataSourceasBindingList<Car>;
                cars.Where(d => d.Make=="Ford").First().Make="My Ford000";}elseMessageBox.Show("Grid has no data");}}publicclassCar:INotifyPropertyChanged{privatestring _make;privatestring _model;privateint _year;publiceventPropertyChangedEventHandlerPropertyChanged;publicCar(string make,string model,int year){
            _make = make;
            _model = model;
            _year = year;}publicstringMake{
            get {return _make;}set{
                _make = value;this.NotifyPropertyChanged("Make");}}publicstringModel{
            get {return _model;}set{
                _model = value;this.NotifyPropertyChanged("Model");}}publicintYear{
            get {return _year;}set{
                _year = value;this.NotifyPropertyChanged("Year");}}privatevoidNotifyPropertyChanged(string name){if(PropertyChanged!=null)PropertyChanged(this,newPropertyChangedEventArgs(name));}}}

here is the code where i comment INotifyPropertyChanged and all its related code

namespace PatternSearch{publicpartialclassForm2:Form{publicForm2(){InitializeComponent();}privatevoid btnBindData_Click(object sender,EventArgs e){BindingList<Car> cars =newBindingList<Car>();

            cars.Add(newCar("Ford","Mustang",1967));
            cars.Add(newCar("Shelby AC","Cobra",1965));
            cars.Add(newCar("Chevrolet","Corvette Sting Ray",1965));

            dataGridView1.DataSource= cars;}privatevoid btnUpdate_Click(object sender,EventArgs e){if(dataGridView1.DataSource!=null){BindingList<Car> cars = dataGridView1.DataSourceasBindingList<Car>;
                cars.Where(d => d.Make=="Ford").First().Make="My Ford000";}elseMessageBox.Show("Grid has no data");}}publicclassCar//: INotifyPropertyChanged{privatestring _make;privatestring _model;privateint _year;//public event PropertyChangedEventHandler PropertyChanged;publicCar(string make,string model,int year){
            _make = make;
            _model = model;
            _year = year;}publicstringMake{
            get {return _make;}set{
                _make = value;//this.NotifyPropertyChanged("Make");}}publicstringModel{
            get {return _model;}set{
                _model = value;//this.NotifyPropertyChanged("Model");}}publicintYear{
            get {return _year;}set{
                _year = value;//this.NotifyPropertyChanged("Year");}}privatevoidNotifyPropertyChanged(string name){//if (PropertyChanged != null)//    PropertyChanged(this, new PropertyChangedEventArgs(name));}}}