HashSet(Of T).TrimExcess Method
[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]
Sets the capacity of a HashSet(Of T) object to the actual number of elements it contains, rounded up to a nearby, implementation-specific value.
Assembly: System.Core (in System.Core.dll)
You can use the TrimExcess method to minimize a HashSet(Of T) object's memory overhead once it is known that no new elements will be added. To completely clear a HashSet(Of T) object and release all memory referenced by it, call this method after calling the Clear method.
This method is an O(n) operation, where n is Count.