C#

<br />
using System;<br />
using System.Drawing;<br />
using System.Windows.Forms;<br />
using System.IO;<br />
<br />
public class FolderBrowserDialogExampleForm : System.Windows.Forms.Form<br />
{<br />
    private FolderBrowserDialog folderBrowserDialog1;<br />
    private OpenFileDialog openFileDialog1;<br />
    <br />
    private RichTextBox richTextBox1;<br />
<br />
    private MainMenu mainMenu1;<br />
    private MenuItem fileMenuItem, openMenuItem;<br />
    private MenuItem folderMenuItem, closeMenuItem;<br />
    <br />
    private string openFileName, folderName;<br />
<br />
    private bool fileOpened = false;<br />
<br />
    // The main entry point for the application.<br />
    static void Main() <br />
    {<br />
        Application.Run(new FolderBrowserDialogExampleForm());<br />
    }<br />
<br />
<br />
    // Constructor.<br />
    public FolderBrowserDialogExampleForm()<br />
    {<br />
        this.mainMenu1 = new System.Windows.Forms.MainMenu();<br />
        this.fileMenuItem = new System.Windows.Forms.MenuItem();<br />
        this.openMenuItem = new System.Windows.Forms.MenuItem();<br />
        this.folderMenuItem = new System.Windows.Forms.MenuItem();<br />
        this.closeMenuItem = new System.Windows.Forms.MenuItem();<br />
<br />
        this.openFileDialog1 = new System.Windows.Forms.OpenFileDialog();<br />
        this.folderBrowserDialog1 = new System.Windows.Forms.FolderBrowserDialog();<br />
        this.richTextBox1 = new System.Windows.Forms.RichTextBox();<br />
<br />
        this.mainMenu1.MenuItems.Add(this.fileMenuItem);<br />
        this.fileMenuItem.MenuItems.AddRange(<br />
                            new System.Windows.Forms.MenuItem[] {this.openMenuItem,<br />
                                                                 this.closeMenuItem,<br />
                                                                 this.folderMenuItem});<br />
        this.fileMenuItem.Text = "File";<br />
<br />
        this.openMenuItem.Text = "Open...";<br />
        this.openMenuItem.Click += new System.EventHandler(this.openMenuItem_Click);<br />
<br />
        this.folderMenuItem.Text = "Select Directory...";<br />
        this.folderMenuItem.Click += new System.EventHandler(this.folderMenuItem_Click);<br />
<br />
        this.closeMenuItem.Text = "Close";<br />
        this.closeMenuItem.Click += new System.EventHandler(this.closeMenuItem_Click);<br />
        this.closeMenuItem.Enabled = false;<br />
<br />
        this.openFileDialog1.DefaultExt = "rtf";<br />
        this.openFileDialog1.Filter = "rtf files (*.rtf)|*.rtf";<br />
<br />
        // Set the help text description for the FolderBrowserDialog.<br />
        this.folderBrowserDialog1.Description = <br />
            "Select the directory that you want to use as the default.";<br />
<br />
        // Do not allow the user to create new files via the FolderBrowserDialog.<br />
        this.folderBrowserDialog1.ShowNewFolderButton = false;<br />
<br />
        // Default to the My Documents folder.<br />
        this.folderBrowserDialog1.RootFolder = Environment.SpecialFolder.Personal;<br />
<br />
        this.richTextBox1.AcceptsTab = true;<br />
        this.richTextBox1.Location = new System.Drawing.Point(8, 8);<br />
        this.richTextBox1.Size = new System.Drawing.Size(280, 344);<br />
        this.richTextBox1.Anchor = AnchorStyles.Top | AnchorStyles.Left | <br />
                                   AnchorStyles.Bottom | AnchorStyles.Right;<br />
<br />
        this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);<br />
        this.ClientSize = new System.Drawing.Size(296, 360);<br />
        this.Controls.Add(this.richTextBox1);<br />
        this.Menu = this.mainMenu1;<br />
        this.Text = "RTF Document Browser";<br />
    }<br />
<br />
    // Bring up a dialog to open a file.<br />
    private void openMenuItem_Click(object sender, System.EventArgs e)<br />
    {<br />
        // If a file is not opened, then set the initial directory to the<br />
        // FolderBrowserDialog.SelectedPath value.<br />
        if (!fileOpened) {<br />
            openFileDialog1.InitialDirectory = folderBrowserDialog1.SelectedPath;<br />
            openFileDialog1.FileName = null;<br />
        }<br />
<br />
        // Display the openFile dialog.<br />
        DialogResult result = openFileDialog1.ShowDialog();<br />
<br />
        // OK button was pressed.<br />
        if(result == DialogResult.OK) <br />
        {<br />
            openFileName = openFileDialog1.FileName;<br />
            try<br />
            {<br />
                // Output the requested file in richTextBox1.<br />
                Stream s = openFileDialog1.OpenFile();<br />
                richTextBox1.LoadFile(s, RichTextBoxStreamType.RichText);<br />
                s.Close();    <br />
            <br />
                fileOpened = true;<br />
<br />
            } <br />
            catch(Exception exp)<br />
            {<br />
                MessageBox.Show("An error occurred while attempting to load the file. The error is:" <br />
                                + System.Environment.NewLine + exp.ToString() + System.Environment.NewLine);<br />
                fileOpened = false;<br />
            }<br />
            Invalidate();<br />
<br />
            closeMenuItem.Enabled = fileOpened;<br />
        }<br />
<br />
        // Cancel button was pressed.<br />
        else if(result == DialogResult.Cancel) <br />
        {<br />
            return;<br />
        }<br />
    }<br />
<br />
<br />
    // Close the current file.<br />
    private void closeMenuItem_Click(object sender, System.EventArgs e)<br />
    {<br />
        richTextBox1.Text = "";<br />
        fileOpened = false;<br />
<br />
        closeMenuItem.Enabled = false;<br />
    }<br />
<br />
<br />
    // Bring up a dialog to chose a folder path in which to open or save a file.<br />
    private void folderMenuItem_Click(object sender, System.EventArgs e)<br />
    {<br />
        // Show the FolderBrowserDialog.<br />
        DialogResult result = folderBrowserDialog1.ShowDialog();        <br />
        if( result == DialogResult.OK )<br />
        {<br />
            folderName = folderBrowserDialog1.SelectedPath;           <br />
             if(!fileOpened)<br />
            {<br />
                // No file is opened, bring up openFileDialog in selected path.<br />
                openFileDialog1.InitialDirectory = folderName;<br />
                openFileDialog1.FileName = null;<br />
                openMenuItem.PerformClick();<br />
            } <br />
        }<br />
    }<br />
}<br />