namespace ReadWriteText

 {

     public partial class Form1 : Form

     {

         private readonly OpenFileDialog chooseOpenFileDialog = new OpenFileDialog();

         private string chosenFile;

         public Form1()

         {

             InitializeComponent();

             menuFileOpen.Click += OnFileOpen;

             chooseOpenFileDialog.FileOk += OnOpenFileDialogOK;

             menuFileSave.Click += OnFileSave;

         }

         private void OnFileOpen(object Sender, EventArgs e)

         {

             chooseOpenFileDialog.ShowDialog();

         }

         private void OnFileSave(object Sender, EventArgs e)

         {

             SaveFile();

         }

         private void OnOpenFileDialogOK(object Sender, CancelEventArgs e)

         {

             chosenFile = chooseOpenFileDialog.FileName;

             Text = Path.GetFileName(chosenFile);

             DisplayFile();

         }

         private void SaveFile()

         {

             StreamWriter sw = new StreamWriter(chosenFile, false,

                                                Encoding.Unicode);

             foreach (string line in textBoxContents.Lines)

                 sw.WriteLine(line);

             sw.Close();

         }

         private void DisplayFile()

         {

             StringCollection linesCollection = ReadFileIntoStringCollection();

             string[] linesArray = new string[linesCollection.Count];

             linesCollection.CopyTo(linesArray, );

             textBoxContents.Lines = linesArray;

         }

         private StringCollection ReadFileIntoStringCollection()

         {

             const int MaxBytes = ;

             StreamReader sr = new StreamReader(chosenFile);

             StringCollection result = new StringCollection();

             int nBytesRead = ;

             string nextLine;

             while ((nextLine = sr.ReadLine()) != null)

             {

                 nBytesRead += nextLine.Length;

                 if (nBytesRead > MaxBytes)

                     break;

                 result.Add(nextLine);

             }

             sr.Close();

             return result;

         }

     }

 }

 namespace ReadWriteText

 {

     partial class Form1

     {

         /// <summary>

         /// Required designer variable.

         /// </summary>

         private System.ComponentModel.IContainer components = null;

         /// <summary>

         /// Clean up any resources being used.

         /// </summary>

         /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>

         protected override void Dispose(bool disposing)

         {

             if (disposing && (components != null))

             {

                 components.Dispose();

             }

             base.Dispose(disposing);

         }

         #region Windows Form Designer generated code

         /// <summary>

         /// Required method for Designer support - do not modify

         /// the contents of this method with the code editor.

         /// </summary>

         private void InitializeComponent()

         {

             this.components = new System.ComponentModel.Container();

             this.menuFileOpen = new System.Windows.Forms.MenuItem();

             this.textBoxContents = new System.Windows.Forms.TextBox();

             this.menuItem1 = new System.Windows.Forms.MenuItem();

             this.menuFileSave = new System.Windows.Forms.MenuItem();

             this.mainMenu1 = new System.Windows.Forms.MainMenu(this.components);

             this.SuspendLayout();

             //

             // menuFileOpen

             //

             this.menuFileOpen.Index = ;

             this.menuFileOpen.Text = "&Open";

             //

             // textBoxContents

             //

             this.textBoxContents.Dock = System.Windows.Forms.DockStyle.Fill;

             this.textBoxContents.Font = new System.Drawing.Font("Courier New", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)()));

             this.textBoxContents.Location = new System.Drawing.Point(, );

             this.textBoxContents.Multiline = true;

             this.textBoxContents.Name = "textBoxContents";

             this.textBoxContents.ScrollBars = System.Windows.Forms.ScrollBars.Both;

             this.textBoxContents.Size = new System.Drawing.Size(, );

             this.textBoxContents.TabIndex = ;

             //

             // menuItem1

             //

             this.menuItem1.Index = ;

             this.menuItem1.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {

             this.menuFileOpen,

             this.menuFileSave});

             this.menuItem1.Text = "&File";

             //

             // menuFileSave

             //

             this.menuFileSave.Index = ;

             this.menuFileSave.Text = "&Save";

             //

             // mainMenu1

             //

             this.mainMenu1.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {

             this.menuItem1});

             //

             // Form1

             //

             this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);

             this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;

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

             this.Controls.Add(this.textBoxContents);

             this.Menu = this.mainMenu1;

             this.Name = "Form1";

             this.Text = "Form1";

             this.ResumeLayout(false);

             this.PerformLayout();

         }

         #endregion

         private System.Windows.Forms.MenuItem menuFileOpen;

         private System.Windows.Forms.TextBox textBoxContents;

         private System.Windows.Forms.MenuItem menuItem1;

         private System.Windows.Forms.MenuItem menuFileSave;

         private System.Windows.Forms.MainMenu mainMenu1;

     }

 }