C# extend array

C#
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();
Source

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