binding a combobox to different DataContext - binding

Question

The combobox items are taken from one table, one field on which binding is made. After I saved in the database the selected item in another table, I want that the selected item to be the one which was saved. But the selected item is lost. So, my question is: can I bind the combobox to two DataContexts or maybe another solution ?.
To give an example to be more clear: the combobox items are predefined values taken from a datasource and the value selected must be saved and shown on the interface. So, from what I can see must be a binding to the predefined values and also a binding to the value saved to make a connection to the selected item.
Any suggestion?

Answer 1

Ioana, I don't seem to get what you're aiming at..
if you take this xaml:
<Window x:Class="WpfApplication4.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Window1"
Height="300"
Width="300">
<StackPanel>
<TextBox Text="{Binding Path=SelectedText, Mode=TwoWay}"
Width="200"/>
<ComboBox Width="200"
VerticalAlignment="Center"
HorizontalAlignment="Center"
SelectedItem="{Binding Path=SelectedText, Mode=TwoWay}"
ItemsSource="{Binding Path=Texts, Mode=OneWay}">
</ComboBox>
</StackPanel>
</Window>
and this codebehind:
public partial class Window1 : INotifyPropertyChanged
{
public Window1()
{
InitializeComponent();
this.Texts = new List<string>(new[] {"foo","bar"});
this.DataContext = this;
}
private ObservableCollection<string> texts;
public ObservableCollection<string> Texts
{
get
{
return texts;
}
set
{
texts = value;
if (this.PropertyChanged != null) this.PropertyChanged(this, new PropertyChangedEventArgs("Texts"));
}
}
private string selectedText;
public string SelectedText
{
get
{
return selectedText;
}
set
{
selectedText = value;
if (this.PropertyChanged != null) this.PropertyChanged(this, new PropertyChangedEventArgs("SelectedText"));
}
}
public event PropertyChangedEventHandler PropertyChanged;
}
You do have the Items and the selectedValue databound.
Notice the INotifyPropertyChanged.
Is this what you're trying to achieve ?