2. Collections.Generic: This method is used to add all the elements of an array to a collection of the same type. This library can be determined by the namespace System.Collections.Generic.C#
3. Arrays: This method is used to add all the elements of one array to another array of the same type. This library can be determined by the namespace System.C# using System; int[] firstArray = { 1, 2, 3 }; int[] secondArray = new int[5]; Array.Copy(firstArray, secondArray, firstArray.Length); ```