Надо запустить процесс notepad средствами WinAPI

Работаю в C#. Надо запустить процесс notepad средствами WinAPI. Надо, чтобы просто передо мной открылось окно notepad. Но функция CreateProcess возвращает false, и notepad не запускается. Что я делаю не так?

public class ProcessInfo
{
public IntPtr hProcess;
public IntPtr hThread;
public Int32 ProcessId;
public Int32 ThreadId;
}
public class SECURITY_ATTRIBUTES
{
public Int32 nLength;
public Int32 lpSecurityDescriptor;
public bool bInheritHandle;
}
[DllImport("kernel32.dll", SetLastError = true)]
private static extern bool CreateProcess
(
string imageName,
string cmdLine,
SECURITY_ATTRIBUTES lpProcessAttributes,
SECURITY_ATTRIBUTES lpThreadAttributes,
bool boolInheritHandles,
Int32 dwCreationFlags,
Int32 lpEnvironment,
string lpszCurrentDir,
byte[] si,
ProcessInfo pi
);
private void button5_Click(object sender, EventArgs e)
{
ProcessInfo ProcInf = null;
byte[] startUpInfo = new byte[18];
startUpInfo[0] = 18 * sizeof(byte);
///////////////////
startUpInfo[1] = 0;
startUpInfo[2] = 0;
startUpInfo[3] = 0;
///////////////////
startUpInfo[4] = 0;
startUpInfo[5] = 0;
startUpInfo[6] = 0;
startUpInfo[7] = 0;
startUpInfo[8] = 0;
startUpInfo[9] = 0;
startUpInfo[10] = 0;
startUpInfo[11] = 1;
startUpInfo[12] = 0;
startUpInfo[13] = 0;
///////////////////////////////
startUpInfo[14] = 0;
///////////////////////////////
startUpInfo[15] = 0;
startUpInfo[16] = 0;
startUpInfo[17] = 0;
SECURITY_ATTRIBUTES ProcessAttr = null;
SECURITY_ATTRIBUTES ThreadAttr = null;
bool b = CreateProcess("D:\\notepad.exe", null, ProcessAttr, ThreadAttr, false, 32, 0, "D:\\", startUpInfo, ProcInf);
}