Form1.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using DevExpress.Utils.Menu;
using DevExpress.XtraEditors;
using DevExpress.XtraEditors.Repository;

namespace FileNavigator {
    public partial class Form1 : XtraForm {
        public static readonly int MaxEntitiesCount = 80;
        public Form1() {
            InitializeComponent();
            Initialize();
        }

        void myItem_Click(object sender, EventArgs e) {
            throw new NotImplementedException();
        }

        void Properties_QueryPopUp(object sender, CancelEventArgs e) {
            throw new NotImplementedException();
        }


        //Set the Breadcrumb Editor's initial path
        void Initialize() {
            breadCrumbEdit1.Path = Environment.GetFolderPath(Environment.SpecialFolder.Desktop);
            foreach (DriveInfo driveInfo in GetFixedDrives()) {
                breadCrumbEdit1.Properties.History.Add(new BreadCrumbHistoryItem(driveInfo.RootDirectory.ToString()));
            }
        }

        private void breadCrumbEdit1_Properties_NewNodeAdding(object sender, DevExpress.XtraEditors.BreadCrumbNewNodeAddingEventArgs e) {
            e.Node.PopulateOnDemand = true;
        }

        //Check whether or not the target path exists
        private void breadCrumbEdit1_Properties_ValidatePath(object sender, DevExpress.XtraEditors.BreadCrumbValidatePathEventArgs e) {
            if (!Directory.Exists(e.Path)) {
                e.ValidationResult = DevExpress.XtraEditors.BreadCrumbValidatePathResult.Cancel;
                return;
            }
            e.ValidationResult = DevExpress.XtraEditors.BreadCrumbValidatePathResult.CreateNodes;
        }

        private void breadCrumbEdit1_Properties_QueryChildNodes(object sender, DevExpress.XtraEditors.BreadCrumbQueryChildNodesEventArgs e) {
            //Add custom shortcuts to the 'Root' node
            if (string.Equals(e.Node.Caption, "Root", StringComparison.Ordinal)) {
                InitBreadCrumbRootNode(e.Node);
                return;
            }
            //Add local discs shortcuts to the 'Root' node
            if (string.Equals(e.Node.Caption, "Computer", StringComparison.Ordinal)) {
                InitBreadCrumbComputerNode(e.Node);
                return;
            }
            //Populate dynamic nodes
            string dir = e.Node.Path;
            if (!Directory.Exists(dir))
                return;
            string[] subDirs = GetSubFolders(dir);
            for (int i = 0; i < subDirs.Length; i++) {
                e.Node.ChildNodes.Add(CreateNode(subDirs[i]));
            }
        }

        void InitBreadCrumbRootNode(BreadCrumbNode node) {
            node.ChildNodes.Add(new BreadCrumbNode("Desktop", Environment.GetFolderPath(Environment.SpecialFolder.Desktop)));
            node.ChildNodes.Add(new BreadCrumbNode("Windows", Environment.GetFolderPath(Environment.SpecialFolder.Windows)));
            node.ChildNodes.Add(new BreadCrumbNode("Program Files", Environment.GetFolderPath(Environment.SpecialFolder.ProgramFiles)));
        }
        void InitBreadCrumbComputerNode(BreadCrumbNode node) {
            foreach (DriveInfo driveInfo in GetFixedDrives()) {
                node.ChildNodes.Add(new BreadCrumbNode(driveInfo.Name, driveInfo.RootDirectory));
            }
        }

        protected BreadCrumbNode CreateNode(string path) {
            string folderName = new DirectoryInfo(path).Name;
            return new BreadCrumbNode(folderName, folderName, true);
        }

        //Get the local drives list
        public static IEnumerable<DriveInfo> GetFixedDrives() {
            foreach (DriveInfo driveInfo in DriveInfo.GetDrives()) {
                if (driveInfo.DriveType != DriveType.Fixed) continue;
                yield return driveInfo;
            }
        }

        //Get all subfolders contained within the target directory
        public static string[] GetSubFolders(string rootDir) {
            string[] subDirs = GetSubDirs(rootDir);
            if (subDirs == null)
                return new string[0];
            if (subDirs.Length <= MaxEntitiesCount)
                return subDirs;
            string[] res = new string[MaxEntitiesCount];
            Array.Copy(subDirs, res, res.Length);
            return res;
        }

        //Get the names of the subdirectories
        public static string[] GetSubDirs(string dir) {
            string[] subDirs = null;
            try {
                subDirs = Directory.GetDirectories(dir, "*", SearchOption.TopDirectoryOnly);
            }
            catch { }
            return subDirs;
        }

        private void breadCrumbEdit1_PathChanged(object sender, BreadCrumbPathChangedEventArgs e) {
            label2.Text = breadCrumbEdit1.Path;
        }

        private void breadCrumbEdit1_Properties_PathChanged(object sender, BreadCrumbPathChangedEventArgs e) {

        }
    }
}