#define Graph_And_Chart_PRO using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace ChartAndGraph.DataSource { /// /// base interface for data items (columns and charts) /// public interface IDataItem { String Name { get; set; } void CancelNameChange(); /// /// the first string argument contains the preivous name used by the item /// the second object argumnet is the item itself /// event Action NameChanged; } }