Исправить ошибки в коде - C# (185084)

using System;
using System.Linq;
using System.Text;
using System.IO;
 
namespace _2134
{
    class Program
    {
        static void Main(string[] args)
        {
            int Fmin;
            int Fmax;
            int j;
            int i;
            string path = @"T07_001.txt";
            FileStream fstream = File.OpenRead(path);
            byte[] array = new byte[fstream.Length];
            fstream.Read(array, 0, array.Length);
            string textFromFile = Encoding.Default.GetString(array);
            int N = textFromFile.Length;
            int max = textFromFile.Max();
            int min = textFromFile.Min();
            // Число столбиков на гистограмме
            int points = 100;
            double[] g = new double[points];
            for (int i = 0; i < points; i++)
                g[i] = 0.0;

            double delta = (Fmax - Fmin) / (N + 1);
            //Console.Write(delta + " " ); 
            for (j = 0; j < testArr.Length; j++)
            {
                for (i = 0; i < N; i++)
                {
                    if (testArr[j] >= Fmin + i * delta & testArr[j] < Fmin + (i + 1) * delta)
                    {
 
                        arrA[i] = arrA[i] + 1;
 
                    }
 
                }
 
            }
            string str, trs;
            StreamWriter fstr_out = null;
            fstr_out = new StreamWriter("test.txt");
            for (i = 0; i < N; i++)
            {
 
                arrx[i] = Fmin + i * delta;
                trs = Convert.ToString(arrx[i]) + " ";
                fstr_out.Write(trs);
                Console.Write(arrx[i] + " ");
            }

            foreach (int b in arrA)
            {
                str = Convert.ToString(b) + " ";
                fstr_out.Write(str);
                //Console.Write(x + " "); 
            }
            if (fstr_out != null) fstr_out.Close();
            Console.Read();
 
        }
    }
}