WinAPI в C#.NET

[DllImport("Kernel32.dll", EntryPoint = "GetDriveType")]
private static extern int GetDriveType(IntPtr lpRootPathName);

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
        private struct STARTUPINFO
        {
            public uint cb;
            [MarshalAs(UnmanagedType.LPWStr)]
            public string lpReserved;
            [MarshalAs(UnmanagedType.LPWStr)]
            public string lpDesktop;
            [MarshalAs(UnmanagedType.LPWStr)]
            public string lpTitle;
            public uint dwX;
            public uint dwY;
            public uint dwXSize;
            public uint dwYSize;
            public uint dwXCountChars;
            public uint dwYCountChars;
            public uint dwFillAttribute;
            public uint dwFlags;
            public ushort wShowWindow;
            public ushort cbReserved2;
            public IntPtr lpReserved2;
            public IntPtr hStdInput;
            public IntPtr hStdOutput;
            public IntPtr hStdError;
        }
 
        [StructLayout(LayoutKind.Sequential)]
        private struct PROCESS_INFORMATION
        {
            public IntPtr hProcess;
            public IntPtr hThread;
            public uint dwProcessId;
            public uint dwThreadId;
        }
 
        private delegate int WndEnumProc(IntPtr hwnd, int lParam);
 
        [DllImport("kernel32.dll", EntryPoint = "CreateProcessW", CharSet = CharSet.Unicode, SetLastError = true)]
        private static extern int CreateProcess(
            string lpApplicationName,
            string lpCommandLine,
            IntPtr lpProcessAttributes,
            IntPtr lpThreadAttributes,
            int bInheritHandles,
            uint dwCreationFlags,
            IntPtr lpEnvironment,
            string lpCurrentDirectory,
            ref STARTUPINFO lpStartupInfo,
            out PROCESS_INFORMATION lpProcessInformation);