Advise on proper tools to execute a context menu item or use .net

// Windows Forms project, single form
// compiled against FrameWork 3.5

// interface elements on Form1:

    // a large TextBox set MultiLine = true
    // to display the results of parsing the DropBox folder
    // tbDropBoxPublicParseResults
    
    // a second smaller TextBox set MultiLine = false
    // to display the "stub" for a valid DropBox link
    // tbDropBoxPublicFolderPath

    // a button, and a Click EventHandler
    // to trigger parsing
    // btnParseDropBoxPublicFolder_Click
    
    // three radiobuttons that determine what to parse
    // rbParseRecursive
    // rbParseTopLevelFiles
    // rbParseTopLevelDirectories

using System;
using System.Text;

// you could omit the 'using statement
// for System.Drawing here, but you must
// have a reference to it for this project
// to compile/run: so I think better to
// leave it in !
using System.Drawing;

using System.Windows.Forms;
using System.IO;

namespace Get_DropBox_Public_Links
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        // here, I've put "123456," for a six-digit
        // DropBox unique ID: of course that's only
        // a placeholder for your own unique ID ...
        private string DBoxPublicLinkHeader = @"https://dl.dropbox.com/u/123456/";

        private string replaceSpaceStr = @"%20";
        private string oneSpace = @" ";
        private string newLine = Environment.NewLine;

        private string DTopFolderPath;
        private string DBoxFolderPath;
        private string[] DBoxFolderFiles;
        private string[] DBoxFolderDirectories;
        //
        private string rawLinkPath;
        private string[] whatToParse;
        //
        private int startOfRawLink;

        private void Form1_Load(object sender, EventArgs e)
        {
            // Note the assumption here: the DropBox folder is on the DeskTop
            DTopFolderPath = Environment.GetFolderPath(Environment.SpecialFolder.Desktop);

            DBoxFolderPath = DTopFolderPath + @"\DropBox\Public";
            DBoxFolderFiles = Directory.GetFiles(DBoxFolderPath);
            DBoxFolderDirectories = Directory.GetDirectories(DBoxFolderPath);
            //
            startOfRawLink = DBoxFolderPath.Length + 1;
        }

        private void btnParseDropBoxPublicFolder_Click(object sender, EventArgs e)
        {
            tbDropBoxPublicFolderPath.Text = DBoxPublicLinkHeader;

            tbDropBoxPublicParseResults.Clear();

            // handle parsing top-level files:
            // then recurse on all directories
            // and display all files, per directory
            if (rbParseRecursive.Checked)
            {
                RecursiveParse(DBoxFolderFiles, DBoxFolderDirectories);

                return;
            }

            // parse either top-level files only, or top-level directories only
            whatToParse = rbParseTopLevelFiles.Checked ? DBoxFolderFiles : DBoxFolderDirectories;

            foreach (string theFilePath in whatToParse)
            {
                rawLinkPath = DBoxPublicLinkHeader + theFilePath.Substring(startOfRawLink);
                rawLinkPath = rawLinkPath.Replace(oneSpace, replaceSpaceStr);
                tbDropBoxPublicParseResults.Text += rawLinkPath + newLine;
            }
        }

        private void RecursiveParse(string[] theFiles, string[] theDirectories)
        {

            foreach (string theFilePath in theFiles)
            {
                rawLinkPath = DBoxPublicLinkHeader + theFilePath.Substring(startOfRawLink);
                rawLinkPath = rawLinkPath.Replace(oneSpace, replaceSpaceStr);
                tbDropBoxPublicParseResults.Text += rawLinkPath + newLine;
            }

            foreach (string theDirectoryPath in theDirectories)
            {
                tbDropBoxPublicParseResults.Text += newLine 
                + "Directory: " 
                + theDirectoryPath 
                + " Total Files = " 
                + theFiles.Length.ToString()
                + newLine;

                RecursiveParse(Directory.GetFiles(theDirectoryPath), 
                Directory.GetDirectories(theDirectoryPath));
            }
        }
    }
}