Question

I am using a WPF textbox inside an element host in a Winforms project.

I would like to databind this textbox to a bindingsource as I do with the standard winforms textbox like so:

    Me.tbxCorrectiveAction.DataBindings.Add("Text", bgsTasks, "CorrectiveAction", False)

This is what I have tried:

    Dim host As New System.Windows.Forms.Integration.ElementHost()
    Dim wpfTextBox As New System.Windows.Controls.TextBox()
    wpfTextBox.SpellCheck.IsEnabled = True

    host.Dock = DockStyle.Fill
    host.Child = wpfTextBox
    Me.Panel8.Controls.Add(host)

    Dim binCorrectiveAction As New System.Windows.Data.Binding("CorrectiveAction")
    binCorrectiveAction.Source = bgsTasks
    wpfTextBox.SetBinding(System.Windows.Controls.TextBlock.TextProperty, binCorrectiveAction)

Solutions in either VB or C# are fine.

Answer 1

Try this:

UPDATE.

There’s an error in your code (or just a typo, which causes a logical error).
You’re trying to bind TextBlock.TextProperty on a TextBox control.

There should be TextBox.TextProperty:

        var dataTable = new DataTable();

        dataTable.Columns.Add("Id", typeof(Int32));
        dataTable.Columns.Add("Name", typeof(String));

        dataTable.Rows.Add(1, "John");
        dataTable.Rows.Add(2, "Mary");
        dataTable.Rows.Add(3, "Peter");
        dataTable.Rows.Add(4, "Helen");

        var bindingSource = new BindingSource();
        bindingSource.DataSource = dataTable;

        var binding = new System.Windows.Data.Binding("Name");
        binding.Source = bindingSource;
        binding.UpdateSourceTrigger = System.Windows.Data.UpdateSourceTrigger.PropertyChanged;

        var textBox = new System.Windows.Controls.TextBox();
        textBox.SpellCheck.IsEnabled = true;
        textBox.SetBinding(System.Windows.Controls.TextBox.TextProperty, binding);

        elementHost1.Child = textBox;

The reason is that these dependency properties (and controls) are differ, in spite of they have similar names.

If it isn’t a typo, then I recommend you to read about WPF dependency properties mechanism here.