C# Drag and Drop Copying Controls

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

        private void panel1_DragDrop(object sender, DragEventArgs e)
        {
            
            Control ctrl = e.Data.GetData(e.Data.GetFormats()[0]) as Control;
            if (ctrl != null)
            {
                ctrl.Location = this.panel1.PointToClient(new Point(e.X, e.Y));
                this.panel1.Controls.Add(ctrl);

            }

        }

        private void button1_MouseDown(object sender, MouseEventArgs e)
        {
            //button1.DoDragDrop(button1, DragDropEffects.Copy | DragDropEffects.Move);
            button1.DoDragDrop(button1, DragDropEffects.Copy );
        }

        private void panel1_DragOver(object sender, DragEventArgs e)
        {
            e.Effect = DragDropEffects.Copy; 
        }

        private void Form1_DragOver(object sender, DragEventArgs e)
        {
            e.Effect = DragDropEffects.Copy ; 
        }


        private void Form1_DragDrop(object sender, DragEventArgs e)
        {
            Control ctrl = e.Data.GetData(e.Data.GetFormats()[0]) as Control;
            if (ctrl != null)
            {
                ctrl.Location = this.PointToClient(new Point(e.X, e.Y));
                this.Controls.Add(ctrl);
            }   
        }

        private void button1_Click(object sender, EventArgs e)
        {

        }
    }
}