Simple databinding scenario

I`m trying to simulate simple two-way databinding mechanism. I have declared simple class for that purpose:

Code:

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public class Car : INotifyPropertyChanged
    {       
        string color;
 
        public string Color
        {
            get { return color; }
            set
            {
                color = value;
                OnPropertyChanged("Color");
            }
        }
 
       
       
        public event PropertyChangedEventHandler PropertyChanged;
 
        void OnPropertyChanged(string propertyName)
        {
            if (PropertyChanged != null)
            {
                PropertyChanged(null, new PropertyChangedEventArgs(propertyName));
            }
        }

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I have also created object of that class in Window1.cs file:

Code:

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public partial class Window1 : Window
    {
        Car veh = new Car();
 
 
        public Window1()
        {
            InitializeComponent();
 
            veh.Color="red";
 
            this.DataContext = veh;
        }
 ...

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I have binded this object`s color property for a textbox:

Code:

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<TextBox Canvas.Left="276" Canvas.Top="66" Height="19.277" Width="101">
            <TextBox.Text>
                <Binding Path="Color" Mode="TwoWay"></Binding>
            </TextBox.Text>
        </TextBox>

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Value in this textbox doesn`t refresh however when property of business object changes. What is wrong?

This happens because in your OnPropertyChanged() implementation, you are passing null as the source object. You should pass a reference to the changed object ('this', in this case) instead:

Code:

---

void OnPropertyChanged(string propertyName)
{
    if (PropertyChanged != null)
    {
        PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
    }
}

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