C# LINQ append an item to the end of an array

I have an int[] array. I need to take an int and append it to the end of the array without affecting the position of the other items in that array. Using C# 4 and LINQ what is the most elegant way to achieve this?

My Code:

 int[] items = activeList.Split(',').Select(n => Convert.ToInt32(n)).ToArray();
 int itemToAdd = ddlDisabledTypes.SelectedValue.ToInt(0);

 // Need final list as a string
 string finalList = X

Thanks for any help!