Populating a combobox with different display and value members

I want to populate a combobox with a list that displays one field, but has the value of another using the datareader object.

I am able to do this with a dataset and using the displaymember and valuemember properties of the combobox. However, I'm trying to make the procedure run as quickly as possible. Since I won't be updating the data at all, I figure using a datareader object would be faster, but I'm not sure how to populate a combobox with two values (the displaymember and the valuemember) using a datareader. Can anyone help me here?

haven't tried any code for this, but a combox box has 2 properties, one is selectedtext (which is what you see) and one is selectedvalue which normally are one and the same but of course can be different - try setting the two values differently and experiment.