combo box databinding problem

Hi, everybody,

I have a winform combo box that binds to a dataset created by a sql stored proc. My question is how to make the combo box default to an empty/null value?

The combo is for users to select a Region as searching criteria. It has to be optional, meaning, it has to contain an empty entry with the regular West, East...

Do I make my stored proc returns an empty line at the top of normal data set, or add an empty entry into combo box after it was populated?

Neither seems is the right way to handle the situation.

Thanks!