Drop Down List Entries

Question

Hi,

I have used several drop down list boxes for my program.
So far I have managed to get the information from SQLServer. However, I have noticed that I keep getting one or two blank cells within my drop down lists.
Really I would like to get rid of these blank cells in order to make the drop down lists look neat. I have coded in C#.

Does anyone know why this is happening and whether there is a solution to this problem?

Thanking you in advance