C# Array Merge Without Dupes

Question

Let's say I have these two arrays:

string[] arr1 = new string[2]{"Hello", "Stack"}
string[] arr2 = new string[2]{"Stack", "Overflow"}

How would I merge them to get a third array like so: string[3]{"Hello", "Stack", "Overflow"}?

Answer 1

string[] arr1 = new string[2]{"Hello", "Stack"};
string[] arr2 = new string[2] { "Stack", "Overflow" };

var arr3 = arr1.Union(arr2).ToArray<string>();

Answer 2

string[] arr3 = arr1.Union(arr2).ToArray();

(if you have LINQ and a using System.Linq; directive)