BindingDataSource question

I am fairly new to this BindingDataSource in VS 2005. I dragged the datasource onto a form where it created the textboxes and drop down lists, etc. When I use the toolbar to save a record, I keep getting an error about the saving of the state. Currently the state names are being displayed in the dropdown list with the value set as the state abbreviation. I thought that it would be the value that is saved, however I am getting this error:

"The value violates the MaxLength of this column."

To me right now it was much easier using data adapters and datasets.

What am I missing here

Thanks for the information