This demo displays contact names selected in the Grid View within the 'Selected values' list box.
To allow row selection, add a command column to the Grid View and set its ShowSelectCheckBox property to true. The column will display check boxes within its cells. End-users can check or uncheck these check boxes to select or de-select corresponding data rows.
The SelectionChanged client-side event is handled to display selected contacts within the list box and the number of selected contacts below it. Contact names are obtained using the Grid View's GetSelectedFieldValues client method. The number of selected rows is returned by the GetSelectedRowCount client method.