FormBorderStyle为None的时候如何拖动窗体

//为DllImport导出命名空间,
using System.Runtime.InteropServices;
public partial class Form1 : System.Windows.Forms.Form
{
#region FormBorderStyle为None,拖放窗体
[DllImport("user32.dll")]
public static extern bool ReleaseCapture();
[DllImport("user32.dll")]
public static extern bool SendMessage(IntPtr hwnd, int wMsg, int wParam, int lParam);
public const int WM_SYSCOMMAND = 0x0112;
public const int SC_MOVE = 0xF010;
public const int HTCAPTION = 0x0002;
private void Form_MouseDown(object sender, MouseEventArgs e)
{
ReleaseCapture();
SendMessage(this.Handle, WM_SYSCOMMAND, SC_MOVE + HTCAPTION, 0);
}
#endregion
#region 构造函数
public Form1()
{
//初始化窗体信息
//InitializeComponent();
//绑定鼠标拖动窗体事件
this.MouseDown += new System.Windows.Forms.MouseEventHandler(this.Form_MouseDown);
}
#endregion
}

参考： 

http://www.dxper.net/thread-2525-1-1.html

http://www.cnblogs.com/rogation/p/3508266.html

DllImport：http://blog.csdn.net/jame_peng/article/details/4387906