How to bind TextBoxes to an XML File (with namespace)

I use C#. I want to make a Twoways bind between Textboxes and an XML data source. In order to achieve that, I have written this:

1  Binding source = new Binding();
2
3  // object ddd = XmlManager.Instance.CreateAttributeOrElement(XPath);
4  source.Path =
5      new PropertyPath(
6          string.Format("(XmlManager.Instance.CreateAttributeOrElement({0}))", XPath));
7  source.Mode = BindingMode.TwoWay; 
8
9  UIElementos.UiTexto textoCampo = this as UIElementos.UiTexto;
10 textoCampo.elementoTexto.SetBinding(TextBox.TextProperty, source);

Where:

• XPath = "dummyns/@totalConcept"
• XmlManager.Instance.CreateAttributeOrElement creates the attribute in the XML Document which the bind will to do to TextBoxes.
• The CreateAttributeOrElement method of the XMLManager object returns some like this: totalConcept=""

There is a commented line which creates the attribute. The o开发者_如何学JAVAther way is ot make it implicit in the instantiation line of PropertyPath. When either of the ways is executed, it generates an XML Document like this:

<cna:dummyns xmlns:cna=\"http://tempuri.org/XMLSchema.xsd\" totalConcept=\"\" />

But when I assign a value to Textbox, I get this in the Output window:

System.Windows.Data Warning: 78 : BindingExpression (hash=3146959): TransferValue - got raw value {DependencyProperty.UnsetValue}
System.Windows.Data Warning: 86 : BindingExpression (hash=3146959): TransferValue - using fallback/default value ''
System.Windows.Data Warning: 87 : BindingExpression (hash=3146959): TransferValue - using final value ''

So the Bind is not working... In the line #6, I also tried:

string.Format("XmlManager.Instancia.declaracion.Root.Attribute[\"{0}\"].Value", XPath)

But I got the same result.

Has anybody got something similar to this working?

Any comments or suggestions are welcome.

Have you tried something like this ?

<XmlDataProvider x:Key="dataProvider" XPath="RootElement" Source="XMLFile1.xml"/>
...

<TextBox Text="{Binding Source={StaticResource dataProvider}, XPath=//ChildElement/@totalConcept }" />