Csharp/CSharp Tutorial/GUI Windows Forms/RichTextBox — различия между версиями

Текущая версия на 12:15, 26 мая 2010

Содержание

1 Build Menu for a RichTextBox editor
2 Editor based on RichTextBox
3 LoadFile SaveFile
4 RichTextBox based Text Editor
5 RichTextBox: font

Build Menu for a RichTextBox editor

using System;
using System.Drawing;
using System.Windows.Forms;
using System.IO;
public class RichTextBoxes : Form
{
  RichTextBox rtxt;
  public RichTextBoxes()
  {
    Size = new Size(400, 500);
               
    rtxt = new RichTextBox();
    rtxt.Parent = this;
    rtxt.Text = "Enter text here.";
    rtxt.Multiline = true;
    rtxt.BorderStyle = BorderStyle.Fixed3D;
    rtxt.ScrollBars = RichTextBoxScrollBars.ForcedBoth;  
    rtxt.Dock = DockStyle.Fill;
    rtxt.DetectUrls = true;       
    rtxt.AutoWordSelection = true;  
    rtxt.BulletIndent = 10;
    rtxt.ShowSelectionMargin = true;
    MenuItem mnuImport = new MenuItem("&Import",new EventHandler(mnuImport_Click));
    MenuItem mnuFile = new MenuItem("&File",new MenuItem[] {mnuImport});
    MenuItem mnuDash1 = new MenuItem("-");
    MenuItem mnuDash2 = new MenuItem("-");
    MenuItem mnuUndo = new MenuItem("&Undo",new EventHandler(mnuUndo_Click),Shortcut.CtrlZ);
    MenuItem mnuCut = new MenuItem("Cu&t",  new EventHandler(mnuCut_Click),  Shortcut.CtrlX);
    MenuItem mnuCopy = new MenuItem("&Copy",new EventHandler(mnuCopy_Click),Shortcut.CtrlC);
    MenuItem mnuCopyRtf = new MenuItem("Copy &Rtf",  new EventHandler(mnuCopyRtf_Click));
    MenuItem mnuPaste = new MenuItem("&Paste",new EventHandler(mnuPaste_Click),Shortcut.CtrlV);
    MenuItem mnuDelete = new MenuItem("&Delete",new EventHandler(mnuDelete_Click));
    MenuItem mnuSelectAll = new MenuItem("Select &All",  new EventHandler(mnuSelectAll_Click),Shortcut.CtrlA);
    MenuItem mnuSelect5 = new MenuItem("Select First &5",new EventHandler(mnuSelect5_Click),Shortcut.Ctrl5);
    MenuItem mnuClear = new MenuItem("Clea&r",new EventHandler(mnuClear_Click));
    MenuItem mnuEdit = new MenuItem("&Edit",new MenuItem[] {mnuUndo, mnuDash1, 
                    mnuCut, mnuCopy, mnuCopyRtf, mnuPaste, 
                    mnuDelete, mnuDash2, mnuSelectAll, 
                    mnuSelect5, mnuClear});
    MenuItem mnuScrollToCaret = new MenuItem("&Scroll to Caret",new EventHandler(mnuScrollToCaret_Click));
    MenuItem mnuView = new MenuItem("&View",new MenuItem[] {mnuScrollToCaret});
    
    MenuItem mnuAlignLeft = new MenuItem("Align&Left",new EventHandler(mnuAlignLeft_Click));
    MenuItem mnuAlignRight = new MenuItem("Align&Right",new EventHandler(mnuAlignRight_Click));
    MenuItem mnuAlignCenter = new MenuItem("Align&Center",new EventHandler(mnuAlignCenter_Click));
    MenuItem mnuBullet = new MenuItem("&Bullet",new EventHandler(mnuBullet_Click));
    MenuItem mnuAlign = new MenuItem("&Align",new MenuItem[] {mnuAlignLeft, mnuAlignRight, mnuAlignCenter});
    MenuItem mnuRed = new MenuItem("&Red",new EventHandler(mnuRed_Click));
    MenuItem mnuBold = new MenuItem("Bo&ld",new EventHandler(mnuBold_Click));
    MenuItem mnuHang = new MenuItem("&Hanging Indent",new EventHandler(mnuHang_Click));
    MenuItem mnuIndent = new MenuItem("&Indent",new EventHandler(mnuIndent_Click));
    MenuItem mnuRightIndent = new MenuItem("&Right Indent",  new EventHandler(mnuRightIndent_Click));
    MenuItem mnuFormat = new MenuItem("For&mat",new MenuItem[] {mnuBullet, mnuAlign, 
                    mnuRed, mnuBold, mnuHang, mnuIndent, 
                    mnuRightIndent});
    Menu = new MainMenu(new MenuItem[] {mnuFile, mnuEdit, 
                    mnuView, mnuFormat});
  }
  static void Main() 
  {
    Application.Run(new RichTextBoxes());
  }
  private void mnuImport_Click(object sender, EventArgs e)
  {
    OpenFileDialog ofd = new OpenFileDialog();
    ofd.InitialDirectory = @"c:\";
    ofd.Filter = "RTF files (*.rtf)|*.rtf|" +
                 "All files (*.*)|*.*";
    ofd.FilterIndex = 1;              //  1 based index
    
    if (ofd.ShowDialog() == DialogResult.OK)
    {
      try
      {
        StreamReader reader = new StreamReader(ofd.FileName);
        rtxt.Rtf = reader.ReadToEnd();
        reader.Close();
      }
      catch (Exception ex)
      {
        MessageBox.Show(ex.Message);
        return;
      }
    }
  }
  private void mnuUndo_Click(object sender, EventArgs e)
  {
    if (rtxt.CanUndo == true)
    {
      rtxt.Undo();
      rtxt.ClearUndo();
    }
  }
  private void mnuCut_Click(object sender, EventArgs e)
  {
    if (rtxt.SelectedText != "")
      rtxt.Cut();
  }
  private void mnuCopy_Click(object sender, EventArgs e)
  {
    if (rtxt.SelectionLength > 0)
      rtxt.Copy();
  }
  private void mnuCopyRtf_Click(object sender, EventArgs e)
  {
    if (rtxt.SelectionLength > 0)
    {
      Clipboard.SetDataObject(rtxt.SelectedRtf);
    }
  }
  private void mnuPaste_Click(object sender, EventArgs e)
  {
    if (Clipboard.GetDataObject().GetDataPresent(DataFormats.Text) == true)
    {
      if (rtxt.CanUndo == true)
      {
        if (rtxt.SelectionLength > 0)
        {
          if (MessageBox.Show(
            "Do you want to overwrite the currently selected text?", 
            "Cut & Paste", MessageBoxButtons.YesNo) == DialogResult.No)
            rtxt.SelectionStart = rtxt.SelectionStart + 
                                  rtxt.SelectionLength;
        }
        rtxt.Paste();
      }
    }
  }
  private void mnuDelete_Click(object sender, EventArgs e)
  {
    if (rtxt.SelectionLength > 0)
      rtxt.SelectedText = "";
  }
  private void mnuClear_Click(object sender, EventArgs e)
  {
    rtxt.Clear();
  }

  private void mnuSelect5_Click(object sender, EventArgs e)
  {
    if (rtxt.Text.Length >= 5)
    {
      rtxt.Select(0,5);
    }
    else
    {
      rtxt.Select(0,rtxt.Text.Length);
    }
  }
  private void mnuSelectAll_Click(object sender, EventArgs e)
  {
    rtxt.SelectAll();
  }
  private void mnuScrollToCaret_Click(object sender, EventArgs e)
  {
    rtxt.ScrollToCaret();
  }
  private void mnuBullet_Click(object sender, EventArgs e)
  {
    rtxt.SelectionBullet = !rtxt.SelectionBullet;
  }
  private void mnuAlignLeft_Click(object sender, EventArgs e)
  {
    rtxt.SelectionAlignment = HorizontalAlignment.Left;
  }
  private void mnuAlignRight_Click(object sender, EventArgs e)
  {
    rtxt.SelectionAlignment = HorizontalAlignment.Right;
  }
  private void mnuAlignCenter_Click(object sender, EventArgs e)
  {
    rtxt.SelectionAlignment = HorizontalAlignment.Center;
  }
  private void mnuRed_Click(object sender, EventArgs e)
  {
    if (rtxt.SelectionColor == Color.Red)
      rtxt.SelectionColor = Color.Black;
    else
      rtxt.SelectionColor = Color.Red;
  }
  private void mnuBold_Click(object sender, EventArgs e)
  {
    if (rtxt.SelectionFont.Bold )
      rtxt.SelectionFont = new Font(rtxt.SelectionFont, FontStyle.Regular);
    else
      rtxt.SelectionFont = new Font(rtxt.SelectionFont, FontStyle.Bold);
  }
  private void mnuHang_Click(object sender, EventArgs e)
  {
    if (rtxt.SelectionHangingIndent == 10 )
      rtxt.SelectionHangingIndent = 0;
    else
      rtxt.SelectionHangingIndent = 10;
  }
  private void mnuIndent_Click(object sender, EventArgs e)
  {
    if (rtxt.SelectionIndent == 10 )
      rtxt.SelectionIndent = 0;
    else
      rtxt.SelectionIndent = 10;
  }
  private void mnuRightIndent_Click(object sender, EventArgs e)
  {
    if (rtxt.SelectionRightIndent == 50 )
      rtxt.SelectionRightIndent = 0;
    else
      rtxt.SelectionRightIndent = 50;
  }
}

Editor based on RichTextBox

using System;
using System.Drawing;
using System.Windows.Forms;
using System.IO;
public class RichTextBoxes : Form
{
  RichTextBox rtxt;
  public RichTextBoxes()
  {
    Size = new Size(400, 500);
               
    rtxt = new RichTextBox();
    rtxt.Parent = this;
    rtxt.Text = "Enter text here.";
    rtxt.Multiline = true;
    rtxt.BorderStyle = BorderStyle.Fixed3D;
    rtxt.ScrollBars = RichTextBoxScrollBars.ForcedBoth;  
    rtxt.Dock = DockStyle.Fill;
    rtxt.DetectUrls = true;       
    rtxt.AutoWordSelection = true;  
    rtxt.BulletIndent = 10;
    rtxt.ShowSelectionMargin = true;
    MenuItem mnuImport = new MenuItem("&Import",new EventHandler(mnuImport_Click));
    MenuItem mnuFile = new MenuItem("&File",new MenuItem[] {mnuImport});
    MenuItem mnuDash1 = new MenuItem("-");
    MenuItem mnuDash2 = new MenuItem("-");
    MenuItem mnuUndo = new MenuItem("&Undo",new EventHandler(mnuUndo_Click),Shortcut.CtrlZ);
    MenuItem mnuCut = new MenuItem("Cu&t",  new EventHandler(mnuCut_Click),  Shortcut.CtrlX);
    MenuItem mnuCopy = new MenuItem("&Copy",new EventHandler(mnuCopy_Click),Shortcut.CtrlC);
    MenuItem mnuCopyRtf = new MenuItem("Copy &Rtf",  new EventHandler(mnuCopyRtf_Click));
    MenuItem mnuPaste = new MenuItem("&Paste",new EventHandler(mnuPaste_Click),Shortcut.CtrlV);
    MenuItem mnuDelete = new MenuItem("&Delete",new EventHandler(mnuDelete_Click));
    MenuItem mnuSelectAll = new MenuItem("Select &All",  new EventHandler(mnuSelectAll_Click),Shortcut.CtrlA);
    MenuItem mnuSelect5 = new MenuItem("Select First &5",new EventHandler(mnuSelect5_Click),Shortcut.Ctrl5);
    MenuItem mnuClear = new MenuItem("Clea&r",new EventHandler(mnuClear_Click));
    MenuItem mnuEdit = new MenuItem("&Edit",new MenuItem[] {mnuUndo, mnuDash1, 
                    mnuCut, mnuCopy, mnuCopyRtf, mnuPaste, 
                    mnuDelete, mnuDash2, mnuSelectAll, 
                    mnuSelect5, mnuClear});
    MenuItem mnuScrollToCaret = new MenuItem("&Scroll to Caret",new EventHandler(mnuScrollToCaret_Click));
    MenuItem mnuView = new MenuItem("&View",new MenuItem[] {mnuScrollToCaret});
    
    MenuItem mnuAlignLeft = new MenuItem("Align&Left",new EventHandler(mnuAlignLeft_Click));
    MenuItem mnuAlignRight = new MenuItem("Align&Right",new EventHandler(mnuAlignRight_Click));
    MenuItem mnuAlignCenter = new MenuItem("Align&Center",new EventHandler(mnuAlignCenter_Click));
    MenuItem mnuBullet = new MenuItem("&Bullet",new EventHandler(mnuBullet_Click));
    MenuItem mnuAlign = new MenuItem("&Align",new MenuItem[] {mnuAlignLeft, mnuAlignRight, mnuAlignCenter});
    MenuItem mnuRed = new MenuItem("&Red",new EventHandler(mnuRed_Click));
    MenuItem mnuBold = new MenuItem("Bo&ld",new EventHandler(mnuBold_Click));
    MenuItem mnuHang = new MenuItem("&Hanging Indent",new EventHandler(mnuHang_Click));
    MenuItem mnuIndent = new MenuItem("&Indent",new EventHandler(mnuIndent_Click));
    MenuItem mnuRightIndent = new MenuItem("&Right Indent",  new EventHandler(mnuRightIndent_Click));
    MenuItem mnuFormat = new MenuItem("For&mat",new MenuItem[] {mnuBullet, mnuAlign, 
                    mnuRed, mnuBold, mnuHang, mnuIndent, 
                    mnuRightIndent});
    Menu = new MainMenu(new MenuItem[] {mnuFile, mnuEdit, 
                    mnuView, mnuFormat});
  }
  static void Main() 
  {
    Application.Run(new RichTextBoxes());
  }
  private void mnuImport_Click(object sender, EventArgs e)
  {
    OpenFileDialog ofd = new OpenFileDialog();
    ofd.InitialDirectory = @"c:\";
    ofd.Filter = "RTF files (*.rtf)|*.rtf|" +
                 "All files (*.*)|*.*";
    ofd.FilterIndex = 1;              //  1 based index
    
    if (ofd.ShowDialog() == DialogResult.OK)
    {
      try
      {
        StreamReader reader = new StreamReader(ofd.FileName);
        rtxt.Rtf = reader.ReadToEnd();
        reader.Close();
      }
      catch (Exception ex)
      {
        MessageBox.Show(ex.Message);
        return;
      }
    }
  }
  private void mnuUndo_Click(object sender, EventArgs e)
  {
    if (rtxt.CanUndo == true)
    {
      rtxt.Undo();
      rtxt.ClearUndo();
    }
  }
  private void mnuCut_Click(object sender, EventArgs e)
  {
    if (rtxt.SelectedText != "")
      rtxt.Cut();
  }
  private void mnuCopy_Click(object sender, EventArgs e)
  {
    if (rtxt.SelectionLength > 0)
      rtxt.Copy();
  }
  private void mnuCopyRtf_Click(object sender, EventArgs e)
  {
    if (rtxt.SelectionLength > 0)
    {
      Clipboard.SetDataObject(rtxt.SelectedRtf);
    }
  }
  private void mnuPaste_Click(object sender, EventArgs e)
  {
    if (Clipboard.GetDataObject().GetDataPresent(DataFormats.Text) == true)
    {
      if (rtxt.CanUndo == true)
      {
        if (rtxt.SelectionLength > 0)
        {
          if (MessageBox.Show(
            "Do you want to overwrite the currently selected text?", 
            "Cut & Paste", MessageBoxButtons.YesNo) == DialogResult.No)
            rtxt.SelectionStart = rtxt.SelectionStart + 
                                  rtxt.SelectionLength;
        }
        rtxt.Paste();
      }
    }
  }
  private void mnuDelete_Click(object sender, EventArgs e)
  {
    if (rtxt.SelectionLength > 0)
      rtxt.SelectedText = "";
  }
  private void mnuClear_Click(object sender, EventArgs e)
  {
    rtxt.Clear();
  }

  private void mnuSelect5_Click(object sender, EventArgs e)
  {
    if (rtxt.Text.Length >= 5)
    {
      rtxt.Select(0,5);
    }
    else
    {
      rtxt.Select(0,rtxt.Text.Length);
    }
  }
  private void mnuSelectAll_Click(object sender, EventArgs e)
  {
    rtxt.SelectAll();
  }
  private void mnuScrollToCaret_Click(object sender, EventArgs e)
  {
    rtxt.ScrollToCaret();
  }
  private void mnuBullet_Click(object sender, EventArgs e)
  {
    rtxt.SelectionBullet = !rtxt.SelectionBullet;
  }
  private void mnuAlignLeft_Click(object sender, EventArgs e)
  {
    rtxt.SelectionAlignment = HorizontalAlignment.Left;
  }
  private void mnuAlignRight_Click(object sender, EventArgs e)
  {
    rtxt.SelectionAlignment = HorizontalAlignment.Right;
  }
  private void mnuAlignCenter_Click(object sender, EventArgs e)
  {
    rtxt.SelectionAlignment = HorizontalAlignment.Center;
  }
  private void mnuRed_Click(object sender, EventArgs e)
  {
    if (rtxt.SelectionColor == Color.Red)
      rtxt.SelectionColor = Color.Black;
    else
      rtxt.SelectionColor = Color.Red;
  }
  private void mnuBold_Click(object sender, EventArgs e)
  {
    if (rtxt.SelectionFont.Bold )
      rtxt.SelectionFont = new Font(rtxt.SelectionFont, FontStyle.Regular);
    else
      rtxt.SelectionFont = new Font(rtxt.SelectionFont, FontStyle.Bold);
  }
  private void mnuHang_Click(object sender, EventArgs e)
  {
    if (rtxt.SelectionHangingIndent == 10 )
      rtxt.SelectionHangingIndent = 0;
    else
      rtxt.SelectionHangingIndent = 10;
  }
  private void mnuIndent_Click(object sender, EventArgs e)
  {
    if (rtxt.SelectionIndent == 10 )
      rtxt.SelectionIndent = 0;
    else
      rtxt.SelectionIndent = 10;
  }
  private void mnuRightIndent_Click(object sender, EventArgs e)
  {
    if (rtxt.SelectionRightIndent == 50 )
      rtxt.SelectionRightIndent = 0;
    else
      rtxt.SelectionRightIndent = 50;
  }
}

LoadFile SaveFile

using System;
using System.Collections.Generic;
using System.ruponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

public class Form1 : Form {
    public Form1() {
        InitializeComponent();
    }
    private void MenuItemShowHelpMenu_Click(object sender, EventArgs e) {
        ToolStripMenuItem item = (ToolStripMenuItem)sender;
        MenuItemHelp.Visible = item.Checked;
    }
    private void MenuItemNew_Click(object sender, EventArgs e) {
        richTextBoxText.Text = "";
    }
    private void MenuItemOpen_Click(object sender, EventArgs e) {
        richTextBoxText.LoadFile(@".\Example.rtf");
    }
    private void MenuItemSave_Click(object sender, EventArgs e) {
        richTextBoxText.SaveFile(@".\Example.rtf");
    }
    private void InitializeComponent() {
        this.menuStrip1 = new System.Windows.Forms.MenuStrip();
        this.fileToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();
        this.MenuItemNew = new System.Windows.Forms.ToolStripMenuItem();
        this.MenuItemOpen = new System.Windows.Forms.ToolStripMenuItem();
        this.toolStripMenuItem1 = new System.Windows.Forms.ToolStripSeparator();
        this.MenuItemSave = new System.Windows.Forms.ToolStripMenuItem();
        this.saveAsToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();
        this.toolStripSeparator1 = new System.Windows.Forms.ToolStripSeparator();
        this.printToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();
        this.toolStripMenuItem4 = new System.Windows.Forms.ToolStripMenuItem();
        this.toolStripMenuItem2 = new System.Windows.Forms.ToolStripSeparator();
        this.exitToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();
        this.formatToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();
        this.MenuItemShowHelpMenu = new System.Windows.Forms.ToolStripMenuItem();
        this.MenuItemHelp = new System.Windows.Forms.ToolStripMenuItem();
        this.contentsToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();
        this.indexToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();
        this.searchToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();
        this.toolStripMenuItem3 = new System.Windows.Forms.ToolStripSeparator();
        this.aboutToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();
        this.richTextBoxText = new System.Windows.Forms.RichTextBox();
        this.menuStrip1.SuspendLayout();
        this.SuspendLayout();
        this.menuStrip1.Items.AddRange(new System.Windows.Forms.ToolStripItem[] {
            this.fileToolStripMenuItem,
            this.formatToolStripMenuItem,
            this.MenuItemHelp});
        this.menuStrip1.Location = new System.Drawing.Point(0, 0);
        this.menuStrip1.Name = "menuStrip1";
        this.menuStrip1.Size = new System.Drawing.Size(602, 24);
        this.menuStrip1.TabIndex = 0;
        this.menuStrip1.Text = "menuStrip1";
        this.fileToolStripMenuItem.DropDownItems.AddRange(new System.Windows.Forms.ToolStripItem[] {
            this.MenuItemNew,
            this.MenuItemOpen,
            this.toolStripMenuItem1,
            this.MenuItemSave,
            this.saveAsToolStripMenuItem,
            this.toolStripSeparator1,
            this.printToolStripMenuItem,
            this.toolStripMenuItem4,
            this.toolStripMenuItem2,
            this.exitToolStripMenuItem});
        this.fileToolStripMenuItem.Name = "fileToolStripMenuItem";
        this.fileToolStripMenuItem.Size = new System.Drawing.Size(35, 20);
        this.fileToolStripMenuItem.Text = "&File";
        this.MenuItemNew.Name = "MenuItemNew";
        this.MenuItemNew.ShortcutKeys = ((System.Windows.Forms.Keys)((System.Windows.Forms.Keys.Control | System.Windows.Forms.Keys.N)));
        this.MenuItemNew.Size = new System.Drawing.Size(151, 22);
        this.MenuItemNew.Text = "&New";
        this.MenuItemNew.Click += new System.EventHandler(this.MenuItemNew_Click);
        this.MenuItemOpen.Name = "MenuItemOpen";
        this.MenuItemOpen.ShortcutKeys = ((System.Windows.Forms.Keys)((System.Windows.Forms.Keys.Control | System.Windows.Forms.Keys.O)));
        this.MenuItemOpen.Size = new System.Drawing.Size(151, 22);
        this.MenuItemOpen.Text = "&Open";
        this.MenuItemOpen.Click += new System.EventHandler(this.MenuItemOpen_Click);
        this.toolStripMenuItem1.Name = "toolStripMenuItem1";
        this.toolStripMenuItem1.Size = new System.Drawing.Size(148, 6);
        this.MenuItemSave.Name = "MenuItemSave";
        this.MenuItemSave.ShortcutKeys = ((System.Windows.Forms.Keys)((System.Windows.Forms.Keys.Control | System.Windows.Forms.Keys.S)));
        this.MenuItemSave.Size = new System.Drawing.Size(151, 22);
        this.MenuItemSave.Text = "&Save";
        this.MenuItemSave.Click += new System.EventHandler(this.MenuItemSave_Click);
        this.saveAsToolStripMenuItem.Name = "saveAsToolStripMenuItem";
        this.saveAsToolStripMenuItem.Size = new System.Drawing.Size(151, 22);
        this.saveAsToolStripMenuItem.Text = "Save &As";
        this.toolStripSeparator1.Name = "toolStripSeparator1";
        this.toolStripSeparator1.Size = new System.Drawing.Size(148, 6);
        this.printToolStripMenuItem.Name = "printToolStripMenuItem";
        this.printToolStripMenuItem.ShortcutKeys = ((System.Windows.Forms.Keys)((System.Windows.Forms.Keys.Control | System.Windows.Forms.Keys.P)));
        this.printToolStripMenuItem.Size = new System.Drawing.Size(151, 22);
        this.printToolStripMenuItem.Text = "&Print";
        this.toolStripMenuItem4.Name = "toolStripMenuItem4";
        this.toolStripMenuItem4.Size = new System.Drawing.Size(151, 22);
        this.toolStripMenuItem4.Text = "Print Preview";
        this.toolStripMenuItem2.Name = "toolStripMenuItem2";
        this.toolStripMenuItem2.Size = new System.Drawing.Size(148, 6);
        this.exitToolStripMenuItem.Name = "exitToolStripMenuItem";
        this.exitToolStripMenuItem.Size = new System.Drawing.Size(151, 22);
        this.exitToolStripMenuItem.Text = "E&xit";
        this.formatToolStripMenuItem.DropDownItems.AddRange(new System.Windows.Forms.ToolStripItem[] {
            this.MenuItemShowHelpMenu});
        this.formatToolStripMenuItem.Name = "formatToolStripMenuItem";
        this.formatToolStripMenuItem.Size = new System.Drawing.Size(53, 20);
        this.formatToolStripMenuItem.Text = "Format";
        this.MenuItemShowHelpMenu.Checked = true;
        this.MenuItemShowHelpMenu.CheckOnClick = true;
        this.MenuItemShowHelpMenu.CheckState = System.Windows.Forms.CheckState.Checked;
        this.MenuItemShowHelpMenu.Name = "MenuItemShowHelpMenu";
        this.MenuItemShowHelpMenu.Size = new System.Drawing.Size(164, 22);
        this.MenuItemShowHelpMenu.Text = "Show Help Menu";
        this.MenuItemShowHelpMenu.Click += new System.EventHandler(this.MenuItemShowHelpMenu_Click);
        this.MenuItemHelp.DropDownItems.AddRange(new System.Windows.Forms.ToolStripItem[] {
            this.contentsToolStripMenuItem,
            this.indexToolStripMenuItem,
            this.searchToolStripMenuItem,
            this.toolStripMenuItem3,
            this.aboutToolStripMenuItem});
        this.MenuItemHelp.Name = "MenuItemHelp";
        this.MenuItemHelp.Size = new System.Drawing.Size(40, 20);
        this.MenuItemHelp.Text = "&Help";
        this.contentsToolStripMenuItem.Name = "contentsToolStripMenuItem";
        this.contentsToolStripMenuItem.Size = new System.Drawing.Size(129, 22);
        this.contentsToolStripMenuItem.Text = "Contents";
        this.indexToolStripMenuItem.Name = "indexToolStripMenuItem";
        this.indexToolStripMenuItem.Size = new System.Drawing.Size(129, 22);
        this.indexToolStripMenuItem.Text = "Index";
        this.searchToolStripMenuItem.Name = "searchToolStripMenuItem";
        this.searchToolStripMenuItem.Size = new System.Drawing.Size(129, 22);
        this.searchToolStripMenuItem.Text = "Search";
        this.toolStripMenuItem3.Name = "toolStripMenuItem3";
        this.toolStripMenuItem3.Size = new System.Drawing.Size(126, 6);
        this.aboutToolStripMenuItem.Name = "aboutToolStripMenuItem";
        this.aboutToolStripMenuItem.Size = new System.Drawing.Size(129, 22);
        this.aboutToolStripMenuItem.Text = "About";
        this.richTextBoxText.Dock = System.Windows.Forms.DockStyle.Fill;
        this.richTextBoxText.Location = new System.Drawing.Point(0, 24);
        this.richTextBoxText.Name = "richTextBoxText";
        this.richTextBoxText.Size = new System.Drawing.Size(602, 242);
        this.richTextBoxText.TabIndex = 1;
        this.richTextBoxText.Text = "";
        this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
        this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
        this.ClientSize = new System.Drawing.Size(602, 266);
        this.Controls.Add(this.richTextBoxText);
        this.Controls.Add(this.menuStrip1);
        this.MainMenuStrip = this.menuStrip1;
        this.menuStrip1.ResumeLayout(false);
        this.menuStrip1.PerformLayout();
        this.ResumeLayout(false);
        this.PerformLayout();
    }

    private System.Windows.Forms.MenuStrip menuStrip1;
    private System.Windows.Forms.ToolStripMenuItem fileToolStripMenuItem;
    private System.Windows.Forms.ToolStripMenuItem MenuItemNew;
    private System.Windows.Forms.ToolStripMenuItem MenuItemOpen;
    private System.Windows.Forms.ToolStripSeparator toolStripMenuItem1;
    private System.Windows.Forms.ToolStripMenuItem MenuItemSave;
    private System.Windows.Forms.ToolStripMenuItem saveAsToolStripMenuItem;
    private System.Windows.Forms.ToolStripMenuItem printToolStripMenuItem;
    private System.Windows.Forms.ToolStripSeparator toolStripMenuItem2;
    private System.Windows.Forms.ToolStripMenuItem exitToolStripMenuItem;
    private System.Windows.Forms.ToolStripMenuItem MenuItemHelp;
    private System.Windows.Forms.ToolStripMenuItem contentsToolStripMenuItem;
    private System.Windows.Forms.ToolStripMenuItem indexToolStripMenuItem;
    private System.Windows.Forms.ToolStripMenuItem searchToolStripMenuItem;
    private System.Windows.Forms.ToolStripSeparator toolStripMenuItem3;
    private System.Windows.Forms.ToolStripMenuItem aboutToolStripMenuItem;
    private System.Windows.Forms.ToolStripSeparator toolStripSeparator1;
    private System.Windows.Forms.ToolStripMenuItem toolStripMenuItem4;
    private System.Windows.Forms.ToolStripMenuItem formatToolStripMenuItem;
    private System.Windows.Forms.ToolStripMenuItem MenuItemShowHelpMenu;
    private System.Windows.Forms.RichTextBox richTextBoxText;
    [STAThread]
    static void Main() {
        Application.EnableVisualStyles();
        Application.SetCompatibleTextRenderingDefault(false);
        Application.Run(new Form1());
    }
}

RichTextBox based Text Editor

using System;
using System.Collections.Generic;
using System.ruponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
public class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
        this.ToolStripComboBoxFonts.SelectedIndex = 0;
    }
    private void MenuItemShowHelpMenu_CheckedChanged(object sender, EventArgs e)
    {
        ToolStripMenuItem item = (ToolStripMenuItem)sender;
        MenuItemHelp.Visible = item.Checked;
    }
    private void MenuItemOpen_Click(object sender, EventArgs e)
    {
        richTextBoxText.LoadFile("Example.rtf");
    }
    private void MenuItemSave_Click(object sender, EventArgs e)
    {
        richTextBoxText.SaveFile("Example.rtf");
    }
    private void MenuItemNew_Click(object sender, EventArgs e)
    {
        richTextBoxText.Text = "";
    }
    private void ToolStripButtonBold_CheckedChanged(object sender, EventArgs e)
    {
        Font oldFont;
        Font newFont;
        bool checkState = ((ToolStripButton)sender).Checked;
        oldFont = this.richTextBoxText.SelectionFont;
        if (!checkState)
            newFont = new Font(oldFont, oldFont.Style & ~FontStyle.Bold);
        else
            newFont = new Font(oldFont, oldFont.Style | FontStyle.Bold);
        this.richTextBoxText.SelectionFont = newFont;
        this.richTextBoxText.Focus();
        this.ToolStripMenuItemBold.CheckedChanged -= new EventHandler(ToolStripMenuItemBold_CheckedChanged);
        this.ToolStripMenuItemBold.Checked = checkState;
        this.ToolStripMenuItemBold.CheckedChanged += new EventHandler(ToolStripMenuItemBold_CheckedChanged);
        if (!checkState)
            toolStripStatusLabelBold.Font = new Font(toolStripStatusLabelBold.Font, toolStripStatusLabelBold.Font.Style & ~FontStyle.Bold);
        else
            toolStripStatusLabelBold.Font = new Font(toolStripStatusLabelBold.Font, toolStripStatusLabelBold.Font.Style | FontStyle.Bold);
    }
    private void ToolStripButtonItalic_CheckedChanged(object sender, EventArgs e)
    {
        Font oldFont;
        Font newFont;
        bool checkState = ((ToolStripButton)sender).Checked;
        oldFont = this.richTextBoxText.SelectionFont;
        if (!checkState)
            newFont = new Font(oldFont, oldFont.Style & ~FontStyle.Italic);
        else
            newFont = new Font(oldFont, oldFont.Style | FontStyle.Italic);
        this.richTextBoxText.SelectionFont = newFont;
        this.richTextBoxText.Focus();
        this.ToolStripMenuItemItalic.CheckedChanged -= new EventHandler(ToolStripMenuItemItalic_CheckedChanged);
        this.ToolStripMenuItemItalic.Checked = checkState;
        this.ToolStripMenuItemItalic.CheckedChanged += new EventHandler(ToolStripMenuItemItalic_CheckedChanged);
        if (!checkState)
            toolStripStatusLabelItalic.Font = new Font(toolStripStatusLabelItalic.Font, toolStripStatusLabelItalic.Font.Style & ~FontStyle.Italic);
        else
            toolStripStatusLabelItalic.Font = new Font(toolStripStatusLabelItalic.Font, toolStripStatusLabelItalic.Font.Style | FontStyle.Italic);
    }
    private void ToolStripButtonUnderline_CheckedChanged(object sender, EventArgs e)
    {
        Font oldFont;
        Font newFont;
        bool checkState = ((ToolStripButton)sender).Checked;
        oldFont = this.richTextBoxText.SelectionFont;
        if (!checkState)
            newFont = new Font(oldFont, oldFont.Style & ~FontStyle.Underline);
        else
            newFont = new Font(oldFont, oldFont.Style | FontStyle.Underline);
        this.richTextBoxText.SelectionFont = newFont;
        this.richTextBoxText.Focus();
        this.ToolStripMenuItemUnderline.CheckedChanged -= new EventHandler(ToolStripMenuItemUnderline_CheckedChanged);
        this.ToolStripMenuItemUnderline.Checked = checkState;
        this.ToolStripMenuItemUnderline.CheckedChanged += new EventHandler(ToolStripMenuItemUnderline_CheckedChanged);
        toolStripStatusLabelUnderline.Enabled = checkState;
        if (!checkState)
            toolStripStatusLabelUnderline.Font = new Font(toolStripStatusLabelUnderline.Font, toolStripStatusLabelUnderline.Font.Style & ~FontStyle.Underline);
        else
            toolStripStatusLabelUnderline.Font = new Font(toolStripStatusLabelUnderline.Font, toolStripStatusLabelUnderline.Font.Style | FontStyle.Underline);
    }
    private void ToolStripMenuItemBold_CheckedChanged(object sender, EventArgs e)
    {
        this.ToolStripButtonBold.Checked = ToolStripMenuItemBold.Checked;
    }
    private void ToolStripMenuItemItalic_CheckedChanged(object sender, EventArgs e)
    {
        this.ToolStripButtonItalic.Checked = ToolStripMenuItemItalic.Checked;
    }
    private void ToolStripMenuItemUnderline_CheckedChanged(object sender, EventArgs e)
    {
        this.ToolStripButtonUnderline.Checked = ToolStripMenuItemUnderline.Checked;
    }
    private void ToolStripComboBoxFonts_SelectedIndexChanged(object sender, EventArgs e)
    {
        string text = ((ToolStripComboBox)sender).SelectedItem.ToString();
        Font newFont = null;
        if (richTextBoxText.SelectionFont == null)
            newFont = new Font(text, richTextBoxText.Font.Size);
        else
            newFont = new Font(text, richTextBoxText.SelectionFont.Size,
                                  richTextBoxText.SelectionFont.Style);
        richTextBoxText.SelectionFont = newFont;
    }
    private void richTextBoxText_TextChanged(object sender, EventArgs e)
    {
        toolStripStatusLabelText.Text = "Number of characters: " + richTextBoxText.Text.Length;
    }
    private void toolStripStatusLabelBold_Click(object sender, EventArgs e)
    {
        this.ToolStripButtonBold.Checked = !ToolStripMenuItemBold.Checked;
    }
    private void toolStripStatusLabelItalic_Click(object sender, EventArgs e)
    {
        this.ToolStripButtonItalic.Checked = !ToolStripMenuItemItalic.Checked;
    }
    private void toolStripStatusLabelUnderline_Click(object sender, EventArgs e)
    {
        this.ToolStripButtonUnderline.Checked = !ToolStripMenuItemUnderline.Checked;
    }
    private void InitializeComponent()
    {
        this.menuStrip1 = new System.Windows.Forms.MenuStrip();
        this.fileToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();
        this.MenuItemNew = new System.Windows.Forms.ToolStripMenuItem();
        this.MenuItemOpen = new System.Windows.Forms.ToolStripMenuItem();
        this.toolStripMenuItem1 = new System.Windows.Forms.ToolStripSeparator();
        this.MenuItemSave = new System.Windows.Forms.ToolStripMenuItem();
        this.saveAsToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();
        this.toolStripMenuItem2 = new System.Windows.Forms.ToolStripSeparator();
        this.printToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();
        this.printPreviewToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();
        this.toolStripMenuItem3 = new System.Windows.Forms.ToolStripSeparator();
        this.exitToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();
        this.formatToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();
        this.ToolStripMenuItemBold = new System.Windows.Forms.ToolStripMenuItem();
        this.ToolStripMenuItemItalic = new System.Windows.Forms.ToolStripMenuItem();
        this.ToolStripMenuItemUnderline = new System.Windows.Forms.ToolStripMenuItem();
        this.MenuItemHelp = new System.Windows.Forms.ToolStripMenuItem();
        this.contentsToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();
        this.indexToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();
        this.searchToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();
        this.toolStripMenuItem4 = new System.Windows.Forms.ToolStripSeparator();
        this.aboutToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();
        this.richTextBoxText = new System.Windows.Forms.RichTextBox();
        this.toolStrip1 = new System.Windows.Forms.ToolStrip();
        this.newToolStripButton = new System.Windows.Forms.ToolStripButton();
        this.openToolStripButton = new System.Windows.Forms.ToolStripButton();
        this.saveToolStripButton = new System.Windows.Forms.ToolStripButton();
        this.printToolStripButton = new System.Windows.Forms.ToolStripButton();
        this.toolStripSeparator = new System.Windows.Forms.ToolStripSeparator();
        this.ToolStripButtonBold = new System.Windows.Forms.ToolStripButton();
        this.ToolStripButtonItalic = new System.Windows.Forms.ToolStripButton();
        this.ToolStripButtonUnderline = new System.Windows.Forms.ToolStripButton();
        this.toolStripSeparator1 = new System.Windows.Forms.ToolStripSeparator();
        this.ToolStripComboBoxFonts = new System.Windows.Forms.ToolStripComboBox();
        this.toolStripSeparator2 = new System.Windows.Forms.ToolStripSeparator();
        this.helpToolStripButton = new System.Windows.Forms.ToolStripButton();
        this.statusStrip1 = new System.Windows.Forms.StatusStrip();
        this.toolStripStatusLabelText = new System.Windows.Forms.ToolStripStatusLabel();
        this.toolStripStatusLabelBold = new System.Windows.Forms.ToolStripStatusLabel();
        this.toolStripStatusLabelItalic = new System.Windows.Forms.ToolStripStatusLabel();
        this.toolStripStatusLabelUnderline = new System.Windows.Forms.ToolStripStatusLabel();
        this.menuStrip1.SuspendLayout();
        this.toolStrip1.SuspendLayout();
        this.statusStrip1.SuspendLayout();
        this.SuspendLayout();
        this.menuStrip1.Items.AddRange(new System.Windows.Forms.ToolStripItem[] {
            this.fileToolStripMenuItem,
            this.formatToolStripMenuItem,
            this.MenuItemHelp});
        this.menuStrip1.Location = new System.Drawing.Point(0, 0);
        this.menuStrip1.Size = new System.Drawing.Size(454, 24);
        this.menuStrip1.TabIndex = 0;
        this.menuStrip1.Text = "menuStrip1";
        // 
        this.fileToolStripMenuItem.DropDownItems.AddRange(new System.Windows.Forms.ToolStripItem[] {
            this.MenuItemNew,
            this.MenuItemOpen,
            this.toolStripMenuItem1,
            this.MenuItemSave,
            this.saveAsToolStripMenuItem,
            this.toolStripMenuItem2,
            this.printToolStripMenuItem,
            this.printPreviewToolStripMenuItem,
            this.toolStripMenuItem3,
            this.exitToolStripMenuItem});
        this.fileToolStripMenuItem.Name = "fileToolStripMenuItem";
        this.fileToolStripMenuItem.Size = new System.Drawing.Size(37, 20);
        this.fileToolStripMenuItem.Text = "&File";
        // 
        // MenuItemNew
        // 
        this.MenuItemNew.Name = "MenuItemNew";
        this.MenuItemNew.ShortcutKeys = ((System.Windows.Forms.Keys)((System.Windows.Forms.Keys.Control | System.Windows.Forms.Keys.N)));
        this.MenuItemNew.Size = new System.Drawing.Size(146, 22);
        this.MenuItemNew.Text = "&New";
        this.MenuItemNew.Click += new System.EventHandler(this.MenuItemNew_Click);
        this.MenuItemOpen.Name = "MenuItemOpen";
        this.MenuItemOpen.ShortcutKeys = ((System.Windows.Forms.Keys)((System.Windows.Forms.Keys.Control | System.Windows.Forms.Keys.O)));
        this.MenuItemOpen.Size = new System.Drawing.Size(146, 22);
        this.MenuItemOpen.Text = "&Open";
        this.MenuItemOpen.Click += new System.EventHandler(this.MenuItemOpen_Click);
        this.toolStripMenuItem1.Name = "toolStripMenuItem1";
        this.toolStripMenuItem1.Size = new System.Drawing.Size(143, 6);
        this.MenuItemSave.Name = "MenuItemSave";
        this.MenuItemSave.ShortcutKeys = ((System.Windows.Forms.Keys)((System.Windows.Forms.Keys.Control | System.Windows.Forms.Keys.S)));
        this.MenuItemSave.Size = new System.Drawing.Size(146, 22);
        this.MenuItemSave.Text = "&Save";
        this.MenuItemSave.Click += new System.EventHandler(this.MenuItemSave_Click);
        this.saveAsToolStripMenuItem.Name = "saveAsToolStripMenuItem";
        this.saveAsToolStripMenuItem.Size = new System.Drawing.Size(146, 22);
        this.saveAsToolStripMenuItem.Text = "Save &As";
        // 
        // toolStripMenuItem2
        // 
        this.toolStripMenuItem2.Name = "toolStripMenuItem2";
        this.toolStripMenuItem2.Size = new System.Drawing.Size(143, 6);
        // 
        // printToolStripMenuItem
        // 
        this.printToolStripMenuItem.Name = "printToolStripMenuItem";
        this.printToolStripMenuItem.ShortcutKeys = ((System.Windows.Forms.Keys)((System.Windows.Forms.Keys.Control | System.Windows.Forms.Keys.P)));
        this.printToolStripMenuItem.Size = new System.Drawing.Size(146, 22);
        this.printToolStripMenuItem.Text = "&Print";
        // 
        // printPreviewToolStripMenuItem
        // 
        this.printPreviewToolStripMenuItem.Name = "printPreviewToolStripMenuItem";
        this.printPreviewToolStripMenuItem.Size = new System.Drawing.Size(146, 22);
        this.printPreviewToolStripMenuItem.Text = "Print Preview";
        // 
        // toolStripMenuItem3
        // 
        this.toolStripMenuItem3.Name = "toolStripMenuItem3";
        this.toolStripMenuItem3.Size = new System.Drawing.Size(143, 6);
        // 
        // exitToolStripMenuItem
        // 
        this.exitToolStripMenuItem.Name = "exitToolStripMenuItem";
        this.exitToolStripMenuItem.Size = new System.Drawing.Size(146, 22);
        this.exitToolStripMenuItem.Text = "E&xit";
        // 
        // formatToolStripMenuItem
        // 
        this.formatToolStripMenuItem.DropDownItems.AddRange(new System.Windows.Forms.ToolStripItem[] {
            this.ToolStripMenuItemBold,
            this.ToolStripMenuItemItalic,
            this.ToolStripMenuItemUnderline});
        this.formatToolStripMenuItem.Name = "formatToolStripMenuItem";
        this.formatToolStripMenuItem.Size = new System.Drawing.Size(57, 20);
        this.formatToolStripMenuItem.Text = "Format";
        // 
        // ToolStripMenuItemBold
        // 
        this.ToolStripMenuItemBold.CheckOnClick = true;
        this.ToolStripMenuItemBold.Name = "ToolStripMenuItemBold";
        this.ToolStripMenuItemBold.Size = new System.Drawing.Size(125, 22);
        this.ToolStripMenuItemBold.Text = "Bold";
        this.ToolStripMenuItemBold.CheckedChanged += new System.EventHandler(this.ToolStripMenuItemBold_CheckedChanged);
        // 
        // ToolStripMenuItemItalic
        // 
        this.ToolStripMenuItemItalic.CheckOnClick = true;
        this.ToolStripMenuItemItalic.Name = "ToolStripMenuItemItalic";
        this.ToolStripMenuItemItalic.Size = new System.Drawing.Size(125, 22);
        this.ToolStripMenuItemItalic.Text = "Italic";
        this.ToolStripMenuItemItalic.CheckedChanged += new System.EventHandler(this.ToolStripMenuItemItalic_CheckedChanged);
        // 
        // ToolStripMenuItemUnderline
        // 
        this.ToolStripMenuItemUnderline.CheckOnClick = true;
        this.ToolStripMenuItemUnderline.Name = "ToolStripMenuItemUnderline";
        this.ToolStripMenuItemUnderline.Size = new System.Drawing.Size(125, 22);
        this.ToolStripMenuItemUnderline.Text = "Underline";
        this.ToolStripMenuItemUnderline.CheckedChanged += new System.EventHandler(this.ToolStripMenuItemUnderline_CheckedChanged);
        // 
        // MenuItemHelp
        // 
        this.MenuItemHelp.DropDownItems.AddRange(new System.Windows.Forms.ToolStripItem[] {
            this.contentsToolStripMenuItem,
            this.indexToolStripMenuItem,
            this.searchToolStripMenuItem,
            this.toolStripMenuItem4,
            this.aboutToolStripMenuItem});
        this.MenuItemHelp.Name = "MenuItemHelp";
        this.MenuItemHelp.Size = new System.Drawing.Size(44, 20);
        this.MenuItemHelp.Text = "&Help";
        // 
        // contentsToolStripMenuItem
        // 
        this.contentsToolStripMenuItem.Name = "contentsToolStripMenuItem";
        this.contentsToolStripMenuItem.Size = new System.Drawing.Size(122, 22);
        this.contentsToolStripMenuItem.Text = "Contents";
        // 
        // indexToolStripMenuItem
        // 
        this.indexToolStripMenuItem.Name = "indexToolStripMenuItem";
        this.indexToolStripMenuItem.Size = new System.Drawing.Size(122, 22);
        this.indexToolStripMenuItem.Text = "Index";
        // 
        // searchToolStripMenuItem
        // 
        this.searchToolStripMenuItem.Name = "searchToolStripMenuItem";
        this.searchToolStripMenuItem.Size = new System.Drawing.Size(122, 22);
        this.searchToolStripMenuItem.Text = "Search";
        // 
        // toolStripMenuItem4
        // 
        this.toolStripMenuItem4.Name = "toolStripMenuItem4";
        this.toolStripMenuItem4.Size = new System.Drawing.Size(119, 6);
        // 
        // aboutToolStripMenuItem
        // 
        this.aboutToolStripMenuItem.Name = "aboutToolStripMenuItem";
        this.aboutToolStripMenuItem.Size = new System.Drawing.Size(122, 22);
        this.aboutToolStripMenuItem.Text = "About";
        // 
        // richTextBoxText
        // 
        this.richTextBoxText.Anchor = ((System.Windows.Forms.AnchorStyles)((((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom)
                    | System.Windows.Forms.AnchorStyles.Left)
                    | System.Windows.Forms.AnchorStyles.Right)));
        this.richTextBoxText.Location = new System.Drawing.Point(0, 52);
        this.richTextBoxText.Name = "richTextBoxText";
        this.richTextBoxText.Size = new System.Drawing.Size(454, 212);
        this.richTextBoxText.TabIndex = 1;
        this.richTextBoxText.Text = "";
        this.richTextBoxText.TextChanged += new System.EventHandler(this.richTextBoxText_TextChanged);
        // 
        // toolStrip1
        // 
        this.toolStrip1.Items.AddRange(new System.Windows.Forms.ToolStripItem[] {
            this.newToolStripButton,
            this.openToolStripButton,
            this.saveToolStripButton,
            this.printToolStripButton,
            this.toolStripSeparator,
            this.ToolStripButtonBold,
            this.ToolStripButtonItalic,
            this.ToolStripButtonUnderline,
            this.toolStripSeparator1,
            this.ToolStripComboBoxFonts,
            this.toolStripSeparator2,
            this.helpToolStripButton});
        this.toolStrip1.Location = new System.Drawing.Point(0, 24);
        this.toolStrip1.Name = "toolStrip1";
        this.toolStrip1.Size = new System.Drawing.Size(454, 25);
        this.toolStrip1.TabIndex = 2;
        this.toolStrip1.Text = "toolStrip1";
        // 
        // newToolStripButton
        // 
        this.newToolStripButton.DisplayStyle = System.Windows.Forms.ToolStripItemDisplayStyle.Image;
        this.newToolStripButton.ImageTransparentColor = System.Drawing.Color.Magenta;
        this.newToolStripButton.Name = "newToolStripButton";
        this.newToolStripButton.Size = new System.Drawing.Size(23, 22);
        this.newToolStripButton.Text = "&New";
        this.newToolStripButton.Click += new System.EventHandler(this.MenuItemNew_Click);
        // 
        // openToolStripButton
        // 
        this.openToolStripButton.DisplayStyle = System.Windows.Forms.ToolStripItemDisplayStyle.Image;
        this.openToolStripButton.ImageTransparentColor = System.Drawing.Color.Magenta;
        this.openToolStripButton.Name = "openToolStripButton";
        this.openToolStripButton.Size = new System.Drawing.Size(23, 22);
        this.openToolStripButton.Text = "&Open";
        this.openToolStripButton.Click += new System.EventHandler(this.MenuItemOpen_Click);
        // 
        // saveToolStripButton
        // 
        this.saveToolStripButton.DisplayStyle = System.Windows.Forms.ToolStripItemDisplayStyle.Image;
        this.saveToolStripButton.ImageTransparentColor = System.Drawing.Color.Magenta;
        this.saveToolStripButton.Name = "saveToolStripButton";
        this.saveToolStripButton.Size = new System.Drawing.Size(23, 22);
        this.saveToolStripButton.Text = "&Save";
        this.saveToolStripButton.Click += new System.EventHandler(this.MenuItemSave_Click);
        // 
        // printToolStripButton
        // 
        this.printToolStripButton.DisplayStyle = System.Windows.Forms.ToolStripItemDisplayStyle.Image;
        this.printToolStripButton.ImageTransparentColor = System.Drawing.Color.Magenta;
        this.printToolStripButton.Name = "printToolStripButton";
        this.printToolStripButton.Size = new System.Drawing.Size(23, 22);
        this.printToolStripButton.Text = "&Print";
        // 
        // toolStripSeparator
        // 
        this.toolStripSeparator.Name = "toolStripSeparator";
        this.toolStripSeparator.Size = new System.Drawing.Size(6, 25);
        // 
        // ToolStripButtonBold
        // 
        this.ToolStripButtonBold.CheckOnClick = true;
        this.ToolStripButtonBold.DisplayStyle = System.Windows.Forms.ToolStripItemDisplayStyle.Image;
        this.ToolStripButtonBold.ImageTransparentColor = System.Drawing.Color.Magenta;
        this.ToolStripButtonBold.Name = "ToolStripButtonBold";
        this.ToolStripButtonBold.Size = new System.Drawing.Size(23, 22);
        this.ToolStripButtonBold.Text = "toolStripButton1";
        this.ToolStripButtonBold.CheckedChanged += new System.EventHandler(this.ToolStripButtonBold_CheckedChanged);
        // 
        // ToolStripButtonItalic
        // 
        this.ToolStripButtonItalic.CheckOnClick = true;
        this.ToolStripButtonItalic.DisplayStyle = System.Windows.Forms.ToolStripItemDisplayStyle.Image;
        this.ToolStripButtonItalic.ImageTransparentColor = System.Drawing.Color.Magenta;
        this.ToolStripButtonItalic.Name = "ToolStripButtonItalic";
        this.ToolStripButtonItalic.Size = new System.Drawing.Size(23, 22);
        this.ToolStripButtonItalic.Text = "toolStripButton2";
        this.ToolStripButtonItalic.CheckedChanged += new System.EventHandler(this.ToolStripButtonItalic_CheckedChanged);
        // 
        // ToolStripButtonUnderline
        // 
        this.ToolStripButtonUnderline.CheckOnClick = true;
        this.ToolStripButtonUnderline.DisplayStyle = System.Windows.Forms.ToolStripItemDisplayStyle.Image;
        this.ToolStripButtonUnderline.ImageTransparentColor = System.Drawing.Color.Magenta;
        this.ToolStripButtonUnderline.Name = "ToolStripButtonUnderline";
        this.ToolStripButtonUnderline.Size = new System.Drawing.Size(23, 22);
        this.ToolStripButtonUnderline.Text = "toolStripButton3";
        this.ToolStripButtonUnderline.CheckedChanged += new System.EventHandler(this.ToolStripButtonUnderline_CheckedChanged);
        // 
        // toolStripSeparator1
        // 
        this.toolStripSeparator1.Name = "toolStripSeparator1";
        this.toolStripSeparator1.Size = new System.Drawing.Size(6, 25);
        // 
        // ToolStripComboBoxFonts
        // 
        this.ToolStripComboBoxFonts.DropDownStyle = System.Windows.Forms.ruboBoxStyle.DropDownList;
        this.ToolStripComboBoxFonts.Items.AddRange(new object[] {
            "MS Sans Serif",
            "Times New Roman"});
        this.ToolStripComboBoxFonts.Name = "ToolStripComboBoxFonts";
        this.ToolStripComboBoxFonts.Size = new System.Drawing.Size(121, 25);
        this.ToolStripComboBoxFonts.SelectedIndexChanged += new System.EventHandler(this.ToolStripComboBoxFonts_SelectedIndexChanged);
        // 
        // toolStripSeparator2
        // 
        this.toolStripSeparator2.Name = "toolStripSeparator2";
        this.toolStripSeparator2.Size = new System.Drawing.Size(6, 25);
        // 
        // helpToolStripButton
        // 
        this.helpToolStripButton.DisplayStyle = System.Windows.Forms.ToolStripItemDisplayStyle.Image;
        this.helpToolStripButton.ImageTransparentColor = System.Drawing.Color.Magenta;
        this.helpToolStripButton.Name = "helpToolStripButton";
        this.helpToolStripButton.Size = new System.Drawing.Size(23, 22);
        this.helpToolStripButton.Text = "He&lp";
        // 
        // statusStrip1
        // 
        this.statusStrip1.Items.AddRange(new System.Windows.Forms.ToolStripItem[] {
            this.toolStripStatusLabelText,
            this.toolStripStatusLabelBold,
            this.toolStripStatusLabelItalic,
            this.toolStripStatusLabelUnderline});
        this.statusStrip1.Location = new System.Drawing.Point(0, 242);
        this.statusStrip1.Name = "statusStrip1";
        this.statusStrip1.Size = new System.Drawing.Size(454, 22);
        this.statusStrip1.TabIndex = 3;
        this.statusStrip1.Text = "statusStrip1";
        // 
        // toolStripStatusLabelText
        // 
        this.toolStripStatusLabelText.AutoSize = false;
        this.toolStripStatusLabelText.DisplayStyle = System.Windows.Forms.ToolStripItemDisplayStyle.Text;
        this.toolStripStatusLabelText.Font = new System.Drawing.Font("Arial", 8.25F, System.Drawing.FontStyle.Bold);
        this.toolStripStatusLabelText.Name = "toolStripStatusLabelText";
        this.toolStripStatusLabelText.Size = new System.Drawing.Size(259, 17);
        this.toolStripStatusLabelText.TextAlign = System.Drawing.ContentAlignment.MiddleLeft;
        // 
        // toolStripStatusLabelBold
        // 
        this.toolStripStatusLabelBold.AutoSize = false;
        this.toolStripStatusLabelBold.DoubleClickEnabled = true;
        this.toolStripStatusLabelBold.Enabled = false;
        this.toolStripStatusLabelBold.Font = new System.Drawing.Font("Arial", 8.25F);
        this.toolStripStatusLabelBold.Name = "toolStripStatusLabelBold";
        this.toolStripStatusLabelBold.Size = new System.Drawing.Size(47, 17);
        this.toolStripStatusLabelBold.Text = "Bold";
        this.toolStripStatusLabelBold.Click += new System.EventHandler(this.toolStripStatusLabelBold_Click);
        // 
        // toolStripStatusLabelItalic
        // 
        this.toolStripStatusLabelItalic.AutoSize = false;
        this.toolStripStatusLabelItalic.DoubleClickEnabled = true;
        this.toolStripStatusLabelItalic.Enabled = false;
        this.toolStripStatusLabelItalic.Font = new System.Drawing.Font("Arial", 8.25F);
        this.toolStripStatusLabelItalic.Name = "toolStripStatusLabelItalic";
        this.toolStripStatusLabelItalic.Size = new System.Drawing.Size(48, 17);
        this.toolStripStatusLabelItalic.Text = "Italic";
        this.toolStripStatusLabelItalic.Click += new System.EventHandler(this.toolStripStatusLabelItalic_Click);
        // 
        // toolStripStatusLabelUnderline
        // 
        this.toolStripStatusLabelUnderline.AutoSize = false;
        this.toolStripStatusLabelUnderline.DoubleClickEnabled = true;
        this.toolStripStatusLabelUnderline.Enabled = false;
        this.toolStripStatusLabelUnderline.Font = new System.Drawing.Font("Arial", 8.25F);
        this.toolStripStatusLabelUnderline.Name = "toolStripStatusLabelUnderline";
        this.toolStripStatusLabelUnderline.Size = new System.Drawing.Size(76, 17);
        this.toolStripStatusLabelUnderline.Text = "Underline";
        this.toolStripStatusLabelUnderline.Click += new System.EventHandler(this.toolStripStatusLabelUnderline_Click);
        // 
        // Form1
        // 
        this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
        this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
        this.ClientSize = new System.Drawing.Size(454, 264);
        this.Controls.Add(this.statusStrip1);
        this.Controls.Add(this.toolStrip1);
        this.Controls.Add(this.richTextBoxText);
        this.Controls.Add(this.menuStrip1);
        this.MainMenuStrip = this.menuStrip1;
        this.menuStrip1.ResumeLayout(false);
        this.menuStrip1.PerformLayout();
        this.toolStrip1.ResumeLayout(false);
        this.toolStrip1.PerformLayout();
        this.statusStrip1.ResumeLayout(false);
        this.statusStrip1.PerformLayout();
        this.ResumeLayout(false);
        this.PerformLayout();
    }
    private System.Windows.Forms.MenuStrip menuStrip1;
    private System.Windows.Forms.ToolStripMenuItem fileToolStripMenuItem;
    private System.Windows.Forms.ToolStripMenuItem MenuItemNew;
    private System.Windows.Forms.ToolStripMenuItem MenuItemOpen;
    private System.Windows.Forms.ToolStripSeparator toolStripMenuItem1;
    private System.Windows.Forms.ToolStripMenuItem MenuItemSave;
    private System.Windows.Forms.ToolStripMenuItem saveAsToolStripMenuItem;
    private System.Windows.Forms.ToolStripSeparator toolStripMenuItem2;
    private System.Windows.Forms.ToolStripMenuItem printToolStripMenuItem;
    private System.Windows.Forms.ToolStripMenuItem printPreviewToolStripMenuItem;
    private System.Windows.Forms.ToolStripSeparator toolStripMenuItem3;
    private System.Windows.Forms.ToolStripMenuItem exitToolStripMenuItem;
    private System.Windows.Forms.ToolStripMenuItem MenuItemHelp;
    private System.Windows.Forms.ToolStripMenuItem contentsToolStripMenuItem;
    private System.Windows.Forms.ToolStripMenuItem indexToolStripMenuItem;
    private System.Windows.Forms.ToolStripMenuItem searchToolStripMenuItem;
    private System.Windows.Forms.ToolStripSeparator toolStripMenuItem4;
    private System.Windows.Forms.ToolStripMenuItem aboutToolStripMenuItem;
    private System.Windows.Forms.ToolStripMenuItem formatToolStripMenuItem;
    private System.Windows.Forms.RichTextBox richTextBoxText;
    private System.Windows.Forms.ToolStripMenuItem ToolStripMenuItemBold;
    private System.Windows.Forms.ToolStripMenuItem ToolStripMenuItemItalic;
    private System.Windows.Forms.ToolStripMenuItem ToolStripMenuItemUnderline;
    private System.Windows.Forms.ToolStrip toolStrip1;
    private System.Windows.Forms.ToolStripButton newToolStripButton;
    private System.Windows.Forms.ToolStripButton openToolStripButton;
    private System.Windows.Forms.ToolStripButton saveToolStripButton;
    private System.Windows.Forms.ToolStripButton printToolStripButton;
    private System.Windows.Forms.ToolStripSeparator toolStripSeparator;
    private System.Windows.Forms.ToolStripButton ToolStripButtonBold;
    private System.Windows.Forms.ToolStripButton ToolStripButtonItalic;
    private System.Windows.Forms.ToolStripButton ToolStripButtonUnderline;
    private System.Windows.Forms.ToolStripSeparator toolStripSeparator1;
    private System.Windows.Forms.ToolStripComboBox ToolStripComboBoxFonts;
    private System.Windows.Forms.ToolStripSeparator toolStripSeparator2;
    private System.Windows.Forms.ToolStripButton helpToolStripButton;
    private System.Windows.Forms.StatusStrip statusStrip1;
    private System.Windows.Forms.ToolStripStatusLabel toolStripStatusLabelText;
    private System.Windows.Forms.ToolStripStatusLabel toolStripStatusLabelBold;
    private System.Windows.Forms.ToolStripStatusLabel toolStripStatusLabelItalic;
    private System.Windows.Forms.ToolStripStatusLabel toolStripStatusLabelUnderline;
    [STAThread]
    static void Main()
    {
        Application.Run(new Form1());
    }
}

RichTextBox: font

using System;
using System.Collections.Generic;
using System.ruponentModel;
using System.Data;
using System.Drawing;
using System.Windows.Forms;

class Form1 : Form {
    public Form1() {
        InitializeComponent();
    }
    private void buttonBold_Click(object sender, EventArgs e) {
        Font oldFont;
        Font newFont;
        oldFont = this.richTextBoxText.SelectionFont;

        if (oldFont.Bold)
            newFont = new Font(oldFont, oldFont.Style & ~FontStyle.Bold);
        else
            newFont = new Font(oldFont, oldFont.Style | FontStyle.Bold);

        this.richTextBoxText.SelectionFont = newFont;
        this.richTextBoxText.Focus();
    }
    private void buttonUnderline_Click(object sender, EventArgs e) {
        Font oldFont;
        Font newFont;

        oldFont = this.richTextBoxText.SelectionFont;
        if (oldFont.Underline)
            newFont = new Font(oldFont, oldFont.Style & ~FontStyle.Underline);
        else
            newFont = new Font(oldFont, oldFont.Style | FontStyle.Underline);
        this.richTextBoxText.SelectionFont = newFont;
        this.richTextBoxText.Focus();
    }
    private void buttonItalic_Click(object sender, EventArgs e) {
        Font oldFont;
        Font newFont;
        oldFont = this.richTextBoxText.SelectionFont;
        if (oldFont.Italic)
            newFont = new Font(oldFont, oldFont.Style & ~FontStyle.Italic);
        else
            newFont = new Font(oldFont, oldFont.Style | FontStyle.Italic);
        this.richTextBoxText.SelectionFont = newFont;
        this.richTextBoxText.Focus();
    }
    private void buttonCenter_Click(object sender, EventArgs e) {
        if (this.richTextBoxText.SelectionAlignment == HorizontalAlignment.Center)
            this.richTextBoxText.SelectionAlignment = HorizontalAlignment.Left;
        else
            this.richTextBoxText.SelectionAlignment = HorizontalAlignment.Center;
        this.richTextBoxText.Focus();
    }
    private void textBoxSize_KeyPress(object sender, KeyPressEventArgs e) {
        if ((e.KeyChar < 48 || e.KeyChar > 57) &&
                                               e.KeyChar != 8 && e.KeyChar != 13) {
            e.Handled = true;
        } else if (e.KeyChar == 13) {
            TextBox txt = (TextBox)sender;
            if (txt.Text.Length > 0)
                ApplyTextSize(txt.Text);
            e.Handled = true;
            this.richTextBoxText.Focus();
        }
    }
    private void textBoxSize_Validating(object sender, CancelEventArgs e) {
        TextBox txt = (TextBox)sender;
        ApplyTextSize(txt.Text);
        this.richTextBoxText.Focus();
    }
    private void ApplyTextSize(string textSize) {
        float newSize = Convert.ToSingle(textSize);
        FontFamily currentFontFamily;
        Font newFont;
        currentFontFamily = this.richTextBoxText.SelectionFont.FontFamily;
        newFont = new Font(currentFontFamily, newSize);
        this.richTextBoxText.SelectionFont = newFont;
    }
    private void richTextBoxText_LinkClicked(object sender, LinkClickedEventArgs e) {
        System.Diagnostics.Process.Start(e.LinkText);
    }
    private void buttonLoad_Click(object sender, EventArgs e) {
        try {
            richTextBoxText.LoadFile("Test.rtf");
        } catch (System.IO.FileNotFoundException) {
            MessageBox.Show("No file to load yet");
        }
    }
    private void buttonSave_Click(object sender, EventArgs e) {
        try {
            richTextBoxText.SaveFile("Test.rtf");
        } catch (System.Exception err) {
            MessageBox.Show(err.Message);
        }
    }
    private void InitializeComponent() {
        this.buttonBold = new System.Windows.Forms.Button();
        this.buttonUnderline = new System.Windows.Forms.Button();
        this.buttonItalic = new System.Windows.Forms.Button();
        this.buttonCenter = new System.Windows.Forms.Button();
        this.buttonSave = new System.Windows.Forms.Button();
        this.buttonLoad = new System.Windows.Forms.Button();
        this.labelSize = new System.Windows.Forms.Label();
        this.textBoxSize = new System.Windows.Forms.TextBox();
        this.richTextBoxText = new System.Windows.Forms.RichTextBox();
        this.SuspendLayout();
        this.buttonBold.Anchor = System.Windows.Forms.AnchorStyles.Top;
        this.buttonBold.Location = new System.Drawing.Point(187, 13);
        this.buttonBold.Margin = new System.Windows.Forms.Padding(3, 3, 3, 1);
        this.buttonBold.Name = "buttonBold";
        this.buttonBold.Size = new System.Drawing.Size(82, 23);
        this.buttonBold.TabIndex = 0;
        this.buttonBold.Text = "Bold";
        this.buttonBold.Click += new System.EventHandler(this.buttonBold_Click);
        this.buttonUnderline.Anchor = System.Windows.Forms.AnchorStyles.Top;
        this.buttonUnderline.Location = new System.Drawing.Point(276, 13);
        this.buttonUnderline.Margin = new System.Windows.Forms.Padding(3, 3, 3, 1);
        this.buttonUnderline.Name = "buttonUnderline";
        this.buttonUnderline.Size = new System.Drawing.Size(82, 23);
        this.buttonUnderline.TabIndex = 1;
        this.buttonUnderline.Text = "Underline";
        this.buttonUnderline.Click += new System.EventHandler(this.buttonUnderline_Click);
        this.buttonItalic.Anchor = System.Windows.Forms.AnchorStyles.Top;
        this.buttonItalic.Location = new System.Drawing.Point(365, 13);
        this.buttonItalic.Name = "buttonItalic";
        this.buttonItalic.Size = new System.Drawing.Size(82, 23);
        this.buttonItalic.TabIndex = 2;
        this.buttonItalic.Text = "Italic";
        this.buttonItalic.Click += new System.EventHandler(this.buttonItalic_Click);
        this.buttonCenter.Anchor = System.Windows.Forms.AnchorStyles.Top;
        this.buttonCenter.Location = new System.Drawing.Point(454, 13);
        this.buttonCenter.Margin = new System.Windows.Forms.Padding(3, 0, 3, 3);
        this.buttonCenter.Name = "buttonCenter";
        this.buttonCenter.Size = new System.Drawing.Size(82, 23);
        this.buttonCenter.TabIndex = 3;
        this.buttonCenter.Text = "Center";
        this.buttonCenter.Click += new System.EventHandler(this.buttonCenter_Click);
        this.buttonSave.Anchor = System.Windows.Forms.AnchorStyles.Bottom;
        this.buttonSave.Location = new System.Drawing.Point(365, 309);
        this.buttonSave.Margin = new System.Windows.Forms.Padding(3, 0, 3, 3);
        this.buttonSave.Name = "buttonSave";
        this.buttonSave.Size = new System.Drawing.Size(82, 23);
        this.buttonSave.TabIndex = 4;
        this.buttonSave.Text = "Save";
        this.buttonSave.Click += new System.EventHandler(this.buttonSave_Click);
        this.buttonLoad.Anchor = System.Windows.Forms.AnchorStyles.Bottom;
        this.buttonLoad.Location = new System.Drawing.Point(276, 309);
        this.buttonLoad.Name = "buttonLoad";
        this.buttonLoad.Size = new System.Drawing.Size(82, 23);
        this.buttonLoad.TabIndex = 5;
        this.buttonLoad.Text = "Load";
        this.buttonLoad.Click += new System.EventHandler(this.buttonLoad_Click);
        this.labelSize.Anchor = System.Windows.Forms.AnchorStyles.Top;
        this.labelSize.AutoSize = true;
        this.labelSize.Location = new System.Drawing.Point(295, 46);
        this.labelSize.Name = "labelSize";
        this.labelSize.Size = new System.Drawing.Size(26, 14);
        this.labelSize.TabIndex = 6;
        this.labelSize.Text = "Size";
        this.textBoxSize.Anchor = System.Windows.Forms.AnchorStyles.Top;
        this.textBoxSize.Location = new System.Drawing.Point(328, 43);
        this.textBoxSize.Name = "textBoxSize";
        this.textBoxSize.TabIndex = 7;
        this.textBoxSize.Text = "10";
        this.textBoxSize.Validating += new System.ruponentModel.CancelEventHandler(this.textBoxSize_Validating);
        this.textBoxSize.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.textBoxSize_KeyPress);
        this.richTextBoxText.Anchor = ((System.Windows.Forms.AnchorStyles)((((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom)
                    | System.Windows.Forms.AnchorStyles.Left)
                    | System.Windows.Forms.AnchorStyles.Right)));
        this.richTextBoxText.Location = new System.Drawing.Point(13, 70);
        this.richTextBoxText.Name = "richTextBoxText";
        this.richTextBoxText.Size = new System.Drawing.Size(686, 232);
        this.richTextBoxText.TabIndex = 8;
        this.richTextBoxText.Text = "";
        this.richTextBoxText.LinkClicked += new System.Windows.Forms.LinkClickedEventHandler(this.richTextBoxText_LinkClicked);
        this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
        this.ClientSize = new System.Drawing.Size(722, 341);
        this.Controls.Add(this.richTextBoxText);
        this.Controls.Add(this.textBoxSize);
        this.Controls.Add(this.labelSize);
        this.Controls.Add(this.buttonLoad);
        this.Controls.Add(this.buttonSave);
        this.Controls.Add(this.buttonCenter);
        this.Controls.Add(this.buttonItalic);
        this.Controls.Add(this.buttonUnderline);
        this.Controls.Add(this.buttonBold);
        this.MinimumSize = new System.Drawing.Size(730, 368);
        this.Name = "Form1";
        this.Text = "RichTextBox Test";
        this.ResumeLayout(false);
        this.PerformLayout();
    }

    private System.Windows.Forms.Button buttonBold;
    private System.Windows.Forms.Button buttonUnderline;
    private System.Windows.Forms.Button buttonItalic;
    private System.Windows.Forms.Button buttonCenter;
    private System.Windows.Forms.Button buttonSave;
    private System.Windows.Forms.Button buttonLoad;
    private System.Windows.Forms.Label labelSize;
    private System.Windows.Forms.TextBox textBoxSize;
    private System.Windows.Forms.RichTextBox richTextBoxText;
    [STAThread]
    static void Main() {
        Application.EnableVisualStyles();
        Application.Run(new Form1());
    }
}

Csharp/CSharp Tutorial/GUI Windows Forms/RichTextBox — различия между версиями

Текущая версия на 12:15, 26 мая 2010

Содержание

Build Menu for a RichTextBox editor

Editor based on RichTextBox

LoadFile SaveFile

RichTextBox based Text Editor

RichTextBox: font

Навигация

Персональные инструменты

Пространства имён

Варианты

Просмотры

Ещё

Поиск

Разделы

Инструменты

Навигация

Текущая версия на 12:15, 26 мая 2010 (просмотреть исходный код) Admin (обсуждение \| вклад) м (1 версия)	Текущая версия на 12:15, 26 мая 2010 (просмотреть исходный код) Admin (обсуждение \| вклад) м (1 версия)
(нет различий)