private const int WM_SysCommand = 0x0112;
private const int OneMsgNum = 0xf017;
[DllImport("user32")]
private static extern bool ReleaseCapture();
[DllImport("user32")]
private static extern bool PostMessage(int hWnd, int Mwg, int wParam, int lParam);

在MOUSEDOWN里面加入
ReleaseCapture();
PostMessage((int)this.front.Handle, WM_SysCommand, OneMsgNum, 0);

那种效果是向系统发送的参数有误，OX0012和OXF017才好，
ReleaseCapture();是捕获MOUSE坐标，
第二个是向系统发送当时消息，通知要移动

用这个方法一样可以在控件的MOUSEDOWN里面加入。便可移动控件