3_A_CSHARP

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 _3_A_CSHARP
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            richTextBox1.AllowDrop = true;
            richTextBox1.DragDrop += new DragEventHandler(this.richTextBox1_DragDrop);
            richTextBox1.DragEnter += new DragEventHandler(this.richTextBox1_DragEnter);
        }

        private void richTextBox1_DragEnter(object sender, System.Windows.Forms.DragEventArgs e)
        {
            if (e.Data.GetDataPresent(DataFormats.FileDrop))
                e.Effect = DragDropEffects.Link;
            else
                e.Effect = DragDropEffects.None;
        }

        private void richTextBox1_DragDrop(object sender, System.Windows.Forms.DragEventArgs e)
        {
            string[] filePath = (string[])e.Data.GetData(DataFormats.FileDrop, false);
            int i;
            for (i = 0; i < filePath.Length; i++)
                this.richTextBox1.AppendText(filePath[i]);
        }


    }
}