I have a datagrid with a context menu. The idea is that the user can select multiple rows on the datagrid, right click and then calls a function that modifies a field for all selected records.
That field is a datetime field in a sql table. I want the user to be able to add or substract minutes to all selected rows. eg. User selects rows 1 to 3, right clicks, chooses "Modify time" and inputs 10 => 10 minutes should be added to the Time filed of rows 1-3 and modify it in the database. If the user inputs -10, 10 minutes should be substracted.