Basic Question on Binding

Question

I am missing something obvious!! All I want to do is bind a property of an Entity to a textbox in a WPF grid. I have spent ages reading the various tutorials and seem to have failed to grasp what is needed. I can easily do it without binding but that would
defeat the object of trying to understand binding.
My XAML is
<Grid x:Name="grdName" HorizontalAlignment="Left" Height="55" Margin="65,62,0,0" VerticalAlignment="Top" Width="268" Background="#FFE3E3E3" >
<TextBox x:Name="txtSurname" HorizontalAlignment="Left" Height="24" Margin="106,21,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="63" TextChanged="txtSurname_TextChanged" DataContext="{Binding Path=Surname}"/>
and the code-behind is
private void cmbPersonKey_SelectionChanged(object sender, SelectionChangedEventArgs e)
string p = cmbPersonKey.SelectedValue.ToString();
Person thisPer = Helpers.context.People.Find(p);
this.grdName.DataContext = thisPer;
this.Show();
John Meers

Answer 1

You are setting the DataContext of the Grid to a Person object in your event handler. This means that any UI element in the Grid can bind to any property of the this Person object. For the Text to show up in the TextBox you should bind its Text property
to a public property of the Person class:
<TextBox x:Name="txtSurname" HorizontalAlignment="Left" Height="24"
Margin="106,21,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="63"
TextChanged="txtSurname_TextChanged" Text="{Binding Path=Surname}"/>
If this doesn't work you need to make sure that your Helpers.context.People.Find method actually returns a Person object, that this Person object has a
public property named "Surname" and that this property has a value.
Hope that helps.
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