wpf textbox text binding - wpf

Question

i am trying to bind the text of a textbox to a property in my class, and it is not working, I am editing the property in the code behind but I don't see the string in the textbox
this is the class, and the property i am trying to bind is called songFolder.
public class song : INotifyPropertyChanged
{
public string title {get; set; }
public string artist { get; set; }
public string path { get; set; }
public static string folder;
public string songsFolder { get { return folder; } set { folder = value; NotifyPropertyChanged("songsFolder"); } }
public event PropertyChangedEventHandler PropertyChanged;
private void NotifyPropertyChanged(String propertyName)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
public song()
{
}
public song(string title, string artist, string path)
{
this.title = title;
this.artist = artist;
this.path = path;
}
}
and the xaml, containing the resource and the textbox wich i am tring to bind
<Window x:Class="WpfApplication1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:WpfApplication1"
Title="Song Filler" Height="455" Width="525">
<Window.Resources>
<local:song x:Key="song"/>
</Window.Resources>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="auto"/>
</Grid.ColumnDefinitions>
<TextBox Name="browseBox" Text="{Binding Source={StaticResource ResourceKey=song}, Path=songsFolder, Mode=TwoWay}" Grid.Column="0"></TextBox>
<Button Grid.Column="1" Width="auto" Click="Browse">browse</Button>
</Grid>
--------------update----------------
I added the next line to ctor of the window:
BrowseBox.DataContext=new song()
And while debugging I saw that the property is changing but the text in the textbox isn't.

Answer 1

The string passed into the NotifyPropertyChanged event should be the same name of the property itself.
public string songsFolder
{
get
{
return folder;
}
set
{
folder = value;
NotifyPropertyChanged("songsFolder");
}
}
Also,
try adding UpdateSourceTrigger="PropertyChanged" to the binding of the textBox
<TextBox Name="browseBox" Text="{Binding Source={StaticResource ResourceKey=song}, Path=songsFolder, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" Grid.Column="0"></TextBox>
Edit: Maybe the DataContext is not getting set correctly. You can also try this method (W/out a static Key)
Code behind, inside the Ctor of the window:
browseBox.DataContext = new song();
Then, update textBox finding to:
<TextBox Name="browseBox" Text="{Binding Path=songsFolder, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" Grid.Column="0"></TextBox>