HttpApplicationStateBase.CopyTo Method (Array, Int32)
When overridden in a derived class, copies the elements of the collection to an array, starting at the specified index in the array.
Assembly: System.Web (in System.Web.dll)
The one-dimensional array that is the destination for the elements that are copied from the collection. The array must have zero-based indexing.
The zero-based index in array at which to begin copying.
Available since 3.5