Gets or sets the position where pages begin to turn when dropped. If the value is 0.0, the default, pages only turns if dropped over the opposite page. Positive values are understood of a proportion of the page width that still trigger a page turn. If value is 0.1, dropping a left page 10 percent to the left of the center of the book still turns the page.

public double DropTolerance {get; set;}

'Declaration
 
Public Property DropTolerance As Double