private void panel1_MouseMove(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
 
                Point newLoc = new Point(e.X+panel1.Location.X, e.Y+panel1.Location.Y);
                panel1.Location = newLoc;
 
            }
        }

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 daniweb
{
  public partial class frmPanel : Form
  {
    private Point start;
 
    public frmPanel()
    {
      InitializeComponent();
    }
 
    private void panel1_MouseDown(object sender, MouseEventArgs e)
    {
      if (e.Button == MouseButtons.Left)
      {
        start = e.Location;
        panel1.MouseUp += new MouseEventHandler(panel1_MouseUp);
        panel1.MouseMove += new MouseEventHandler(panel1_MouseMove);
      }
    }
 
    void panel1_MouseUp(object sender, MouseEventArgs e)
    {
      panel1.MouseMove -= new MouseEventHandler(panel1_MouseMove);
      panel1.MouseUp -= new MouseEventHandler(panel1_MouseUp);
    }
 
    void panel1_MouseMove(object sender, MouseEventArgs e)
    {
      panel1.Location = new Point(panel1.Location.X-(start.X-e.X), panel1.Location.Y-(start.Y - e.Y));
    }
  }
}