鼠标可拖动窗体

using System.Runtime.InteropServices;

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

private void menuStrip2_MouseDown(object sender, MouseEventArgs e)
{
base.OnMouseDown(e);
if (e.Button == MouseButtons.Left)//按下的是鼠标左键
{
Capture = false;//释放鼠标，使能够手动操作
SendMessage(Handle, 0x00A1, 2, 0);//拖动窗体
}
}