'Declaration Public Overloads Function Add( _ ByVal startDate As Date, _ ByVal numberOfDays As Integer _ ) As DateRange
public DateRange Add( DateTime startDate, int numberOfDays )
If startDate falls within the range of an existing DateRange in the collection, that DateRange is updated to include the new dates, and that instance is returned. If startDate is not immediately adjacent to an existing member of the collection, a new DateRange instance is created to describe the added range.
Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Server 2012, Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2