How to filter ComboBox values in winforms

Question

In a .NET winforms application, how can I filter the data in my 2nd ComboBox with respect to the value selected in my 1st ComboBox?

Answer 1

Assuming WinForms:

combo2.DataSource = ((IEnumerable)c.DataSource)
    .Where(x => x == (string)combo1.SelectedValue);

Of course you might need to replace IEnumerable with IEnumerable.