Tecnologia de Programação 1 e 2 (2009)

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

namespace DragEDrop
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_MouseDown(object sender,
            MouseEventArgs e)
        {
            DoDragDrop(sender, DragDropEffects.Move);
        }

        private void panel1_DragEnter(object sender,
            DragEventArgs e)
        {
            e.Effect = DragDropEffects.Move;
        }

        private void panel1_DragDrop(object sender,
            DragEventArgs e)
        {
            Button b = (Button)
                e.Data.GetData(typeof(Button));
            //b.Location = new Point(0, 0);
            // Obtendo a posição do mouse:
            Point p = new Point(e.X, e.Y);
            // Transformando o ponto p
            // para as coordenadas do controle (Panel1)
            b.Location = panel1.PointToClient(p);
            panel1.Controls.Add(b);
        }
    }
}