Pulled this striaght from the Help files ....
Data sources are further managed by BindingManagerBase objects. For each
table in a data source, a BindingManagerBase can be returned from the form's
BindingContext. For example, you can determine the number of rows contained
by a data source by returning the associated BindingManagerBase object's
Count property
myBindingManagerBase.Position = myBindingManagerBase.Count - 1