C# - FolderBrowserDialog

// Open rich text files (rtf) into the RichTextBox using the FolderBrowserDialog

// to set the default directory for opening files.

using System;

using System.Drawing;

using System.Windows.Forms;

using System.IO;

public class FolderBrowserDialogExampleForm : System.Windows.Forms.Form

{

    private FolderBrowserDialog folderBrowserDialog1;

    private OpenFileDialog openFileDialog1;

    private RichTextBox richTextBox1;

    private MainMenu mainMenu1;

    private MenuItem fileMenuItem, openMenuItem;

    private MenuItem folderMenuItem;

    private string openFileName, folderName;

    private bool fileOpened = false;

    // The main entry point for the application.

    [STAThreadAttribute]

    static void Main()

    {

        Application.Run(new FolderBrowserDialogExampleForm());

    }

    // Constructor.

    public FolderBrowserDialogExampleForm()

    {

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

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

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

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

       

        this.openFileDialog1 = new System.Windows.Forms.OpenFileDialog();

        this.folderBrowserDialog1 = new System.Windows.Forms.FolderBrowserDialog();

        this.richTextBox1 = new System.Windows.Forms.RichTextBox();

        this.mainMenu1.MenuItems.Add(this.fileMenuItem);

        this.fileMenuItem.MenuItems.AddRange(

                            new System.Windows.Forms.MenuItem[]  {this.openMenuItem,

                                                                 this.folderMenuItem});

        this.fileMenuItem.Text = "File";

        //(1)

        this.openMenuItem.Text = "Open...";

        this.openMenuItem.Click += new System.EventHandler(this.openMenuItem_Click);

        //(2)

        this.folderMenuItem.Text = "Select Directory...";

        this.folderMenuItem.Click += new System.EventHandler(this.folderMenuItem_Click);

        this.openFileDialog1.DefaultExt = "TXT";

        this.openFileDialog1.Filter = "TXT files (*.txt)|*.txt";

        this.folderBrowserDialog1.Description =

                            "Select the directory that you want to use as the default.";

        this.folderBrowserDialog1.ShowNewFolderButton = false;

        this.folderBrowserDialog1.RootFolder = Environment.SpecialFolder.Personal;

        this.richTextBox1.AcceptsTab = true;

        this.richTextBox1.Location = new System.Drawing.Point(8, 8);

        this.richTextBox1.Size = new System.Drawing.Size(280, 344);

        this.richTextBox1.Anchor = AnchorStyles.Top | AnchorStyles.Left |

                                   AnchorStyles.Bottom | AnchorStyles.Right;

        this.ClientSize = new System.Drawing.Size(296, 360);

        this.Controls.Add(this.richTextBox1);

        this.Menu = this.mainMenu1;

        this.Text = "TXT Document Browser";

    }

       

    private void openMenuItem_Click(object sender, System.EventArgs e)

    {      

        if (!fileOpened)

        {

            openFileDialog1.InitialDirectory = folderBrowserDialog1.SelectedPath;

            openFileDialog1.FileName = null;

        }

      

        DialogResult result = openFileDialog1.ShowDialog();

      

        if (result == DialogResult.OK)

        {

            openFileName = openFileDialog1.FileName;

            try

            {

                // Output the requested file in richTextBox1.

                Stream s = openFileDialog1.OpenFile();

                richTextBox1.LoadFile(s, RichTextBoxStreamType.PlainText);

                //richTextBox1.LoadFile(

                //openFileDialog1.FileName, RichTextBoxStreamType.PlainText);

                s.Close();

                fileOpened = true;

            }

            catch (Exception exp)

            {

                MessageBox.Show(

                       "An error occurred while attempting to load the file. The error is:"

                                + System.Environment.NewLine + exp.ToString()

                                + System.Environment.NewLine);

                fileOpened = false;

            }

            Invalidate();           

        }       

        else if (result == DialogResult.Cancel)

        {

            return;

        }

    }  

    private void folderMenuItem_Click(object sender, System.EventArgs e)

    {       

        DialogResult result = folderBrowserDialog1.ShowDialog();

        if (result == DialogResult.OK)

        {

            folderName = folderBrowserDialog1.SelectedPath;

            if (!fileOpened)

            {              

                openFileDialog1.InitialDirectory = folderName;

                openFileDialog1.FileName = null;

                openMenuItem.PerformClick();

            }

        }

    }

}