using(System.IO.StreamReader sr = new System.IO.StreamReader("F:/C#/graph/graph/bin/Debug/x.txt"))
    {
        string line;
        while((line = sr.ReadLine()) != null)
        {
            string[] x = line.Split(' ');
        }
    }

   using(System.IO.StreamReader sr = new System.IO.StreamReader("F:/C#/graph/graph/bin/Debug/y.txt"))
    {
        string line;
        while((line = sr.ReadLine()) != null)
        {
            string[] yString = line.Split(' ');
        }
        int[] y = Array.ConvertAll(yString , s => int.Parse(s));

    }