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

namespace WindowsFormsApplication2
{
    public partial class BarraSms : Form
    {
        public const int WM_NCLBUTTONDOWN = 0xA1;
        public const int HT_CAPTION = 0x2;

        [DllImportAttribute("user32.dll")]
        public static extern int SendMessage(IntPtr hWnd, int Msg, IntPtr wParam, IntPtr lParam);
        [DllImportAttribute("user32.dll")]
        public static extern bool ReleaseCapture();

        public BarraSms()
        {
            FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;
            MyPanel p = new MyPanel();
            p.BackColor = Color.Red;
            p.Size = new System.Drawing.Size(100, 100);
            p.MouseMove += new MouseEventHandler(p_MouseMove);
            Controls.Add(p);
        }

        void p_MouseMove(object sender, MouseEventArgs e)
        {
            if (e.Button == System.Windows.Forms.MouseButtons.Left)
            {
                ReleaseCapture();
                SendMessage(this.Handle, WM_NCLBUTTONDOWN, new IntPtr(HT_CAPTION), IntPtr.Zero);
            }
        }
    }

    public class MyPanel : System.Windows.Forms.Panel
    {
        // NO EVENTS HERE
    }
}