As I understand you would like to select multiple cells. Then select value with which these cells to be updated. Then click on a 'Check' RadButton click and update the cells with the new value.
This could be done like so:
sender, RoutedEventArgs e)
Club item = cellInfo.Item
// set the value from the combo box, 8 in this case
item.StadiumCapacity = 8;
// update the item in the Database
Is this what are you looking for?
All the best,
the Telerik team
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