我放了两个panel  可以拖着一个label.不知道这样满足的了你的要求不.?

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 TestPanel
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            c = panel1;
        }

        Point pt;
        //bool moves = true;
        private void label1_MouseDown(object sender, MouseEventArgs e)
        {
            pt = Cursor.Position;
        }

        Control c = null;
        private void label1_MouseMove(object sender, MouseEventArgs e)
        {
            int mx = 0;
            int my = 0;
            int px = 0;
            int py = 0;
            int x = 0;
            int y = 0;
            if (e.Button == MouseButtons.Left)
            {
                x = Cursor.Position.X - this.Location.X - 14;
                y = Cursor.Position.Y - this.Location.Y - 32;
                px = Cursor.Position.X - pt.X;
                py = Cursor.Position.Y - pt.Y;
                mx = label1.Location.X + px;
                my = label1.Location.Y + py;
                label1.Location = new Point(mx, my);
                pt = Cursor.Position;

                if (panel1.Bounds.Contains(x, y))
                {
                    if (c.Equals(panel1)) return;
                    mx = label1.Location.X - panel1.Bounds.X;
                    my = label1.Location.Y - panel1.Bounds.Y;
                    label1.Location = new Point(mx, my);
                    c.Controls.Remove(label1);
                    panel1.Controls.Add(label1);
                    c = panel1;
                }
                else if (panel2.Bounds.Contains(x, y))
                {
                    if (c.Equals(panel2)) return;
                    mx = label1.Location.X - panel2.Bounds.X;
                    my = label1.Location.Y - panel2.Bounds.Y;
                    label1.Location = new Point(mx, my);
                    c.Controls.Remove(label1);
                    panel2.Controls.Add(label1);
                    c = panel2;
                }
                else if (this.Bounds.Contains(x, y))
                {
                    if (c.Equals(this)) return;
                    mx = label1.Location.X + c.Bounds.X;
                    my = label1.Location.Y + c.Bounds.Y;
                    label1.Location = new Point(mx, my);
                    c.Controls.Remove(label1);
                    this.Controls.Add(label1);
                    c = this;
                }
            }
        }

        private void label1_MouseUp(object sender, MouseEventArgs e)
        {
            //moves = true;
        }
    }
}