Binding textboxes to properties of a comboBox.SelectedItem

Question

I\'m using winforms and I\'ve got a comboBox that represents an IQueryable. Below the combobox is a series of textboxes that I would like to be bound to the currently selected

Answer 1

My original answer was wrong, and admittedly I do not fully understand what all is happening here, but I have a solution which is working.

Basically you need to grab the BindingManagerBase from the BindingContext and use it to enforce databinding on each SelectedItemChanged event.

public partial class TestForm : Form
{
    public DataClassesDataContext DataContext;

    public IQueryable datasource;
    private BindingManagerBase bmComboBoxSelectedItem;

    // Ctor
    public TestForm()
    {
        InitializeComponent();

        // L2S data context
        this.DataContext = new DataClassesDataContext();

        // Get the variable for the data source
        this.datasource = this.DataContext.Ts;

        // setup the binding for the combobox
        this.comboBox1.DataSource = this.datasource;
        this.comboBox1.DisplayMember = "Description";
        this.comboBox1.ValueMember = "Id";

        // assign the databindings of the text boxes to the selectedItem of the combo box    
        // this is where the problem is, afaik
        TId.DataBindings.Add(new Binding("Text", this.comboBox1, "SelectedItem.Id"));
        TUser.DataBindings.Add(new Binding("Text", this.comboBox1, "SelectedItem.User"));
        TDescription.DataBindings.Add(new Binding("Text", this.comboBox1, "SelectedItem.Description"));

        bmComboBoxSelectedItem = this.BindingContext[this.comboBox1, "SelectedItem"];
    }

    // make sure you assign this event on the forms designer or your preferred method
    private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
    {
        bmCustomers.ResumeBinding();
    }
}

This MSDN article helped a lot.