Bad practice for data sources?

I'm just wondering if it is bad programming practice to have many data sources on one page. I need a "Matrix" type of page that grabs data from many tables and so far I have 5 data sources. Is this common or is there something I should be doing to make it more efficient?That's not unbelievable, I think the most I have in my pages currently is 4 or 5. Mostly for filling dropdowns, and then a grid control, and then maybe a couple more to fill dropdowns in the gridcontrol when it's in edit mode.