class Program { static void Main() { int[] ar1 = { 1, 4, 5, 11, 13, 18 }; int[] ar2 = { 3, 4, 5, 18, 21, 27, 33 }; var segments = new ArraySegment<int>[2] { new ArraySegment<int>(ar1, 0, 3), new ArraySegment<int>(ar2, 3, 3) }; var sum = SumOfSegments(segments); Console.WriteLine("sum of all segments: {0}", sum); Console.ReadKey(); } static int SumOfSegments(ArraySegment<int>[] segments) { int sum = 0; foreach (var segment in segments) { for (int i = segment.Offset; i < segment.Offset + segment.Count; i++) { sum += segment.Array[i]; } } return sum; } }