Trying to get the absolute sum of an int array using console

Question

int[] array = { 4, -10, -8, 9, -2, 15, 5, 10, 4, 2 };

int<Array> b = a.ConvertAll<Array>(x => Math.Abs(x)));

foreach (int value in array)

Console.WriteLine("Abs({0}) = {1}", value, Math.Abs(value));

Console.ReadKey();

 

I'm trying to get the absolute sum of the array above, the code above i have used gives me a list and converts them to absolute numbers but i am looking for the console to output the Sum of the absolute values in the list. But i am unsure on how to tackle this problem. The anwser that i am trying to achieve from the console is 69.