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;
    private Rectangle origClip;
 
    public frmPanel()
    {
      InitializeComponent();
    }
 
    private void panel1_MouseDown(object sender, MouseEventArgs e)
    {
      if (e.Button == MouseButtons.Left)
      {
        origClip = Cursor.Clip;
        start = e.Location;
        panel1.MouseUp += new MouseEventHandler(panel1_MouseUp);
        panel1.MouseMove += new MouseEventHandler(panel1_MouseMove);
 
        Point topLeft = this.PointToScreen(new Point(0 + e.X, 0 + e.Y));
        Point rightBottom = this.PointToScreen(new Point(this.Width, this.Height));
        Size sz = new Size(rightBottom.X - topLeft.X - e.X, rightBottom.Y - topLeft.Y - e.Y);
        Cursor.Clip = new Rectangle(topLeft, sz);
      }
    }
 
    void panel1_MouseUp(object sender, MouseEventArgs e)
    {
      Cursor.Clip = origClip;
      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));
    }
  }
}