C# extend array
string[] items = new string[3] { "input1", "input2", "input3" };
string[] moreItems = new string[10] { "input4", "input5" };
// array to list
List<string> itemsList = items.ToList<string>();
itemsList.Add("newItem");
// or merge an other array to the list
itemsList.AddRange(moreItems);
// list to array
string[] newArray = itemsList.ToArray();