C# - Drag Drop a File/Folder into a TextBox

DragDropToTextBox.cs

using System;
using System.Collections.Generic;
using System.Windows;
using System.Collections.ObjectModel;

namespace TextBoxDragDrop
{
    public partial class TextBoxDragDrop : Window
    {
        private void txtPath_PreviewDragOver(object sender, DragEventArgs e)
        {
            e.Handled = true;
        }

        private void txtPath_Drop(object sender, DragEventArgs e)
        {
            string[] files = (string[])e.Data.GetData(DataFormats.FileDrop);
            if (files != null && files.Length != 0)
                txtPath.Text = files[0];
        }
    }
}