When in browser mode, GridDropDownColumn looks and behaves like a standard GridBoundColumn.
When in edit mode, however, it displays a
drop-down control for each edited cell in the column. This column type
is useful for lookup fields from data tables. To bind this column type:
Set the DataField property to the name of a field in the data source of the table view that contains the column.
Set the DataSourceID property to the ID of a data source control for the lookup list. If the data source contains multiple tables, set
the ListDataMember property to the name of the lookup table.
Set the ListTextField property to the name of the field in the lookup table that provides the text of items in the drop-down control.
Set the ListValueField property to the name of the field in the lookup table that supplies the value for the field specified by the
DataField property.