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

very cryptic question - however, if you are using webforms, you may want to try using the AutoPostback property on the combobox. You can then capture the combobox onChange event and place your filtering code there.

Answer 2

Assuming WinForms:

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

Of course you might need to replace IEnumerable<string> with IEnumerable<YOURTYPE>.

Answer 3

You just fill the second combobox in the selectedindexchanged event of the first combobox. Quite easy, I have done it lots of times.