Position and size of a process window

[guilabonte]

How can I set the position and the size of a process like the security center.

(I use visual studio .net 2005 and c#)

If I use this code for notepad that work fine :

            Process p = new Process();
            p.StartInfo.FileName = "c:\\windows\\notepad.exe";
            //p.StartInfo.FileName = "c:\\windows\\system32\\RunDll32.exe";
            //p.StartInfo.Arguments = " shell32.dll,Control_RunDLL wscui.cpl";
            p.StartInfo.WindowStyle = ProcessWindowStyle.Normal;
            p.Start();
            p.WaitForInputIdle(2000);
            WinAPI.SetWindowPos(p.MainWindowHandle, WinAPI.HWND_TOP, 0, 0, 600, 600, WinAPI.SWP_SHOWWINDOW);

But when I want to start the control center with :
RunDll32.exe shell32.dll,Con trol_RunDLL wscui.cpl

by default this window is centered with a default size. I can't resize it.

I use this :

            WinAPI.STARTUPINFO si = new WinAPI.STARTUPINFO();
            WinAPI.PROCESS_INFORMATION pi = new WinAPI.PROCESS_INFORMATION();
            //si.cb = (uint)Marshal.SizeOf(si);
            si.dwX = 0;
            si.dwY = 0;
            si.dwXSize = 500;
            si.dwYSize = 500;
            si.dwFlags = (uint)(WinAPI.STARTF.STARTF_USEPOSITION) | (uint)WinAPI.STARTF.STARTF_USESIZE;
             WinAPI.CreateProcess("c:\\windows\\system32\\rundll32.exe", " shell32.dll,Control_RunDLL wscui.cpl", IntPtr.Zero, IntPtr.Zero, false, 0, IntPtr.Zero, null, ref si, out pi);
            WinAPI.WaitForInputIdle((int)pi.dwThreadId, int.MaxValue);
            WinAPI.EnumThreadWindows((int)pi.dwThreadId, 0, 0);
            WinAPI.MoveWindow((IntPtr)pi.dwThreadId, 0, 0, 400, 400, true);

It start the correct app but don't move and resize it...

How can I do this with this specific window?

Thanks in advance!