Problem to save array into text file

Question

Hi Everyone,


I have the problem when I tried to save my array into text file... Below is my code with the problem (bold mark):
for the reply, I very appreciate.. thanks

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

using System.IO;

namespace array2d

{

      public partial class Form1 : Form

        {

            private System.Windows.Forms.Button button1 = new Button();

            private System.Windows.Forms.PictureBox pictureBox1 = new PictureBox();

            private Random _rnd = new Random();

            public Form1()

            {

                InitializeComponent();

                //this is usually done in the designer

                this.button1.Location = new System.Drawing.Point(180, 47);

                this.button1.Name = "START";

                this.button1.Size = new System.Drawing.Size(75, 23);

                this.button1.TabIndex = 0;

                this.button1.Text = "START";

                this.button1.UseVisualStyleBackColor = true;

                this.button1.Click += new System.EventHandler(this.button1_Click);

                this.pictureBox1.Location = new System.Drawing.Point(13, 115);

                this.pictureBox1.Name = "pictureBox1";

                this.pictureBox1.Size = new System.Drawing.Size(128, 256);

                this.pictureBox1.TabIndex = 1;

                this.ClientSize = new System.Drawing.Size(500, 470);

                this.Controls.Add(this.pictureBox1);

                this.Controls.Add(this.button1);

            }

            private void button1_Click(object sender, EventArgs e)

            {

                //do a fake image processing for a 32bpp bitmap

                //note that I use 4 bytes for one pixel, 

                //each 4th byte represents the alpha-channel

                //set up an array (x must be multiple of 4)

                byte[,] myMatrix = new byte[800, 200];

                //fill with random (color-) values

                for (int y = 0; y < myMatrix.GetLength(1); y++)

                {

                    for (int x = 0; x < myMatrix.GetLength(0); x++)

                    {

                        myMatrix[x, y] = (byte)_rnd.Next(256);

            

                        

                    }

                }

                //now we have to convert the 2 dimensional array into a one dimensional byte-array

                byte[] pixels = new byte[myMatrix.GetLength(0) * myMatrix.GetLength(1)];

                for (int y = 0; y < myMatrix.GetLength(1); y++)

                {

                    for (int x = 0; x < myMatrix.GetLength(0); x++)

                    {

                        pixels[y * myMatrix.GetLength(0) + x] = myMatrix[x, y];

                       string file_name = "C:\\test.txt";

                        string tLine = "";

                        System.IO.StreamWriter objWriter;

                        objWriter = new System.IO.StreamWriter(file_name);

                        // string[] aryTest = new string[32768];

                        for (int i = 0; i < 5; i++)

                        {

                            tLine = tLine + pixels[i] + "\r\n";

                            objWriter.WriteLine(pixels[i]);

                        }

                       

                    }

                }

                

            }

        }

    }