fileFinder/fileFinder/Form1.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;

namespace fileFinder
{
    public partial class MainForm : Form
    {
        public MainForm()
        {
            InitializeComponent();
        }

        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 = "";
            }
        }




    }
}