using System.Linq; ... int[] y = File .ReadAllText(@"F:/C#/graph/graph/bin/Debug/y.txt") .Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries) .Select(item => int.Parse(item)) .ToArray(); string[] x = File .ReadAllText(@"F:/C#/graph/graph/bin/Debug/x.txt") .Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries) .ToArray();