What do you mean by another control? do you have two comboboxes in your form?
Please check the "ComboBox1_SelectedIndexCh
anged" event handles correctly for the respective controls.
Check the following links:
http://stackoverflow.com/questions/354408/net-winforms-combobox-identical-items-and-the-selectedindexchanged-eventhttp://www.dreamincode.net/forums/showtopic112669.htmRegards,
Raja Muthaiah