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;
using System.Drawing.Drawing2D;
using System.Drawing.Design;
using System.Drawing.Imaging;
using System.Drawing.Printing;
using System.Drawing.Text;

[DllImport("user32.dll")]
        public static extern int ReleaseCapture();
        [DllImport("user32.dll")]
        public static extern IntPtr SendMessage(IntPtr hWnd, int msg, int wparam, int lparam);

private void Form1_MouseDown(object sender, MouseEventArgs e)
        {
             if (e.Button == MouseButtons.Left)            
            {
                ReleaseCapture();
                //Capture = false;              
                SendMessage(Handle, 0x00A1, 2, 0);      
            }       
        }

private void label2_MouseDown(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                //MessageBox.Show(e.Button.ToString());
                ReleaseCapture();
                //Capture = false;
                SendMessage(Handle, 0x00A1, 2, 0);
            }     
        }