winform拖动无边框窗体

去掉form的窗体的边框后无法拖动窗体，下面简单的代码即可实现；

如何去掉边框详见：http://www.cnblogs.com/lgx040605112/archive/2012/10/08/2715438.html

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

namespace WindowsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private Point mPoint = new Point();

        private void Form1_MouseDown(object sender, MouseEventArgs e)
        {
            mPoint.X = e.X;
            mPoint.Y = e.Y;
        }

        private void Form1_MouseMove(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                Point myPosittion = MousePosition;
                myPosittion.Offset(-mPoint.X, -mPoint.Y);
                Location = myPosittion;
            } 
        }
    }
}

另外一种实现方式：

    public partial class NoBorderForm : Form
    {
        /// <summary>
        /// 鼠标是否按下
        /// </summary>
        private bool mouseDown = false;
        
        /// <summary>
        /// 初始移动位置
        /// </summary>
        private Point movePoint;
        
        public NoBorderForm()
        {
            InitializeComponent();

            MouseDown += new MouseEventHandler(NoBorderForm_MouseDown); 
            MouseMove += new MouseEventHandler(NoBorderForm_MouseMove);
            MouseUp += new MouseEventHandler(NoBorderForm_MouseUp);
        }

        void NoBorderForm_MouseUp(object sender, MouseEventArgs e)
        {
            if (mouseDown)
            {
                mouseDown = false;
            }
        }

        void NoBorderForm_MouseMove(object sender, MouseEventArgs e)
        {
            if (mouseDown) 
            {
                Point curPoint = Cursor.Position;
                //Point curPoint = MousePosition;
                int x = curPoint.X - movePoint.X;
                int y = curPoint.Y - movePoint.Y;
                movePoint = curPoint;
                Location = new Point(Location.X + x, Location.Y + y);
            }
        }

        void NoBorderForm_MouseDown(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                mouseDown = true;
                movePoint = Cursor.Position;
                //movePoint = MousePosition;
            }
        }
    }