C#写入文本文档

using System;
using System.IO;

//   C:/Documents and Settings/Administrator/Local Settings/Application Data/Temporary Projects/test/bin/Release     txt文档在这个目录下可以找到

namespace yanghui
{
    class Program
    {
        static void Main(string[] args)
        {
            StreamWriter sw;
            StreamReader inStr = null;

            string textLine = null;
            int[,] a = new int[10, 10];
            a[0, 0] = 1;
            for (int i = 1; i < 10; i++)
            {
                a[i, 0] = 1;
                a[i, i] = 1;
                for (int j = 1; j <= i; j++)
                {
                    a[i, j] = a[i - 1, j - 1] + a[i - 1, j];
                }
            }

                       try
            {
                sw = File.CreateText("xyh.txt");
            }
            catch
            {
                Console.WriteLine("File cannot be created!");
                return;
            }

            for (int i = 0; i < 10; i++)
            {
                for (int j = 0; j <= i; j++)
                {
                    sw.Write("{0}", a[i, j]); //无换行
                    sw.Write(" ");
                }
                sw.WriteLine(); //有换行
            }

            sw.Close();

            //读取文件
            FileInfo textFile = new FileInfo(@"xyh.txt");
            inStr = textFile.OpenText();
            Console.WriteLine("/n Reading from text file ; /n");
            textLine = inStr.ReadLine();

            //   while(textLine != null)
            {
                Console.WriteLine(textLine);
                textLine = inStr.ReadLine();