Why? You don't like making forms for each table?
More technical questions: Each table should have DIFFERENT fields. Ever hear of Normalization? So, if the user selected a table from a dropdown, the textboxes would have to reflect the underlying source. So, you could create a form with all the fields of every table and then hide them. Then when someone selects a table, change the source property for the form and make just those fields visible. Waste of time.
What are you trying to accomplish???