STARTUPINFOEX

C# Definition:

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
public struct STARTUPINFOEX
{
     public STARTUPINFO StartupInfo;
     public IntPtr lpAttributeList;
}

VB Definition:

Structure STARTUPINFOEX 
   Public TODO
End Structure

Notes:

startupInfoEx.StartupInfo.cb = Marshal.SizeOf(startupInfoEx);