In reference to your article:

Check out this code! (Part II)

Published 19 April 07 11:10 AM | Coding4Fun

I have a question about the part where you update the DataSource of the ComboBox to null.

materialTypesComboBox.DataSource = null;

How do you get this to work without getting a NullReferenceException? That's what I keep getting when I step through that line in my code. Any ideas?