First of all i suggest you to the KB article: How to select rows via an unbound checkbox column. Starting with version 13.2, the GridView in the XtraGrid control provides a built-in checkbox column for multiple row selection.
Is there a minimum age to raft or upper age limit? A. 7-years-old for the Classic and 12-years-old for the Challenge. While there is no upper age-limit, we expect everyone to reasonably evaluate his or her fitness level before taking a whitewater rafting trip.
One report says that it used to have an age restriction of 14 when the ride opened at Schlitterbahn in 2014. It also had a minimum height of 54 inches and a combined weight of all riders in the raft to be between 400 and 550 pounds. But officials scrapped the age restriction, deeming the height requirement sufficient.