How to filter ComboBox values in winforms

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

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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>.

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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.

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