When overridden in a derived class, gets the number of rows managed by the System.Windows.Forms.BindingManagerBase.
Documentation for this section has not yet been entered.
Use the BindingManagerBase.Count property to determine the last item in the list of rows maintained by the System.Windows.Forms.BindingManagerBase. To go to the last item, set the BindingManagerBase.Position property to the BindingManagerBase.Count property value minus 1.