fileFinder/fileFinder/MainForm.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.IO;

namespace fileFinder
{
    public partial class MainForm : Form
    {
        public MainForm()
        {
            InitializeComponent();
            try
            {
                ImageList iconList = new ImageList();
                iconList.Images.Add(Image.FromFile("Folder.png"));          // 0
                iconList.Images.Add(Image.FromFile("OpenedFolder.png"));    // 1
                iconList.Images.Add(Image.FromFile("File.png"));            // 2
                iconList.Images.Add(Image.FromFile("Search.png"));          // 3
                resultViewer.ImageList = iconList;
                resultViewer.ImageIndex = 3;
                resultViewer.SelectedImageIndex = 3;
            } catch { }

        }

        private void dirSelectBtn_Click(object sender, EventArgs e)
        {
            using (var dialog = new FolderBrowserDialog())
            {
                DialogResult result = dialog.ShowDialog();
                if (result == DialogResult.OK && !String.IsNullOrWhiteSpace(dialog.SelectedPath))
                {
                    curDirTextBox.Text = dialog.SelectedPath;
                    hintHided = true;
                }
            }
        }

        bool hintHided = false;
        private void curDirTextBox_Enter(object sender, EventArgs e)
        {
            if (!hintHided)
            {
                hintHided = true;
                curDirTextBox.Text = "";
            }
        }

        private void handleSearchBtn_Click(object sender, EventArgs e)
        {
            resultViewer.Nodes.Clear();
            List<String> foundFiles = new List<String>();
            TreeNode itemsNode = new TreeNode();

            try
            {
                foundFiles = Directory.GetFiles(curDirTextBox.Text, queryTextBox.Text, SearchOption.AllDirectories).ToList<String>();
            } catch { }

            foreach (String item in foundFiles)
                fillChildNode(itemsNode, item.Replace(curDirTextBox.Text, ""));

            resultViewer.Nodes.Add(itemsNode);
        }

        public void fillChildNode (TreeNode node, String item)
        {
            int backSlashIndex = item.IndexOf("\\");
            if (backSlashIndex > -1)
            {
                if (backSlashIndex == 0)
                {
                    item = item.Remove(0, 1);
                    backSlashIndex = item.IndexOf("\\");
                }
                String currentNodeName = item.Substring(0, backSlashIndex);
                int nodeIndex = node.Nodes.IndexOfKey(currentNodeName);
                if (nodeIndex != -1)
                    fillChildNode(node.Nodes[nodeIndex], item.Remove(0, backSlashIndex + 1));
                else
                {
                    node.Nodes.Add(currentNodeName, currentNodeName, 0, 0);
                    nodeIndex = node.Nodes.IndexOfKey(currentNodeName);
                    fillChildNode(node.Nodes[nodeIndex], item.Remove(0, backSlashIndex + 1));
                }
            } else
                node.Nodes.Add(item, item, 2, 2);
        }


    }
}