调用user32.dll轻松移动窗体上任何控件

//引用命名空间　System.Runtime.InteropServices
[DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]
public static extern IntPtr SendMessage(IntPtr hWnd, int wMsg, int wParam, int lParam);

pictureBox1.MouseMove += delegate(object sender, MouseEventArgs e)
{
    PictureBox picbox = (PictureBox)sender;
    picbox.Capture = false;
    SendMessage(picbox.Handle, 0x0112, 0xF012, 0);
};