public System.string ColumnDescription {get; set;}
Data columns can have description text added. If the data field is hovered over in a selection screen in the Report Designer, the description text will pop up in a tooltip.
Tooltip text can be added verbatim in the Column Description field. In-line HTML tags like <b> can also be used if desired. Text may also be registered in the language files. For more information, review the Column Metadata section of the Data Objects article on the Support Center.
public System.string ColumnDescription {get; set;}