DataGrid -- no data shows up

Question

I have a datagrid whose datasource is an SQL 2000 table -- when I run the program, the grid appears with the columns formatted exactly as I specified, but NO data. When I run the query that underlies the datasource, on the database table itself, I get results. Does anybody have an idea why that could be? I have another control (a listbox) connected to the same database (different table), and I get results in that control with no problems.