private static extern bool WriteFile(IntPtr handle,

        bool result = WriteFile(_handle, buffer, (uint)count, ref written, IntPtr.Zero);

Warning! GetOverlappedResult writes to the address of the buffer specified in the ORIGINAL OPERATION (ie/ ReadFile or WriteFile). .NET may move the address of the buffer before GetOverlappedResult returns, resulting in a buffer overflow. Use AllocHGlobal and FreeHGlobal or otherwise ensure the buffer is pinned between the two calls.

        if (!WriteFile(hDevice, pBuffer, dwBytesToWrite, ref lpNumberOfBytesWritten, ref lpOverlapped) &&

WriteFileGather

static extern bool WriteFileGather(IntPtr hFile, [Out] FILE_SEGMENT_ELEMENT []

static extern unsafe int WriteFileGather(IntPtr hFile,

ReadFileScatter, ReadFile, WriteFile

static extern bool WriteFileEx(IntPtr hFile, byte [] lpBuffer,

   WriteFileCompletionDelegate lpCompletionRoutine);

  public delegate void WriteFileCompletionDelegate(UInt32 dwErrorCode,

  static extern bool WriteFileEx(IntPtr hFile, byte [] lpBuffer,

    WriteFileCompletionDelegate lpCompletionRoutine);

    WriteFileEx(hfile, new byte[] { (byte)'t', (byte)'e', (byte)'s', (byte)'t' }, 4, ref ol, new WriteFileCompletionDelegate(Class1.callback));

static extern bool WriteFileGather(IntPtr hFile, [Out] FILE_SEGMENT_ELEMENT []

static extern unsafe int WriteFileGather(IntPtr hFile,

This function is provided for compatibility with 16-bit versions of Windows. New applications should use the WriteFile function.

static extern Boolean WriteFile(IntPtr fFile, Byte[] lpBuffer, UInt32 nNumberOfBytesToWrite,

Declare Function WriteFile Lib "coredll.dll" (TODO) As TODO

Public Declare Function WriteFile Lib "coredll" ( _

    WriteFile hFile, MyString, LenB(MyString), lWritten, 0

Private Declare Function WriteFile Lib “kernel32″ _

Ret = WriteFile(DeviceHandle, PrintOut, _

public static extern int CeWriteFile(

function info on msdn at http://msdn.microsoft.com/library/default.asp?url=/library/en-us/wceactsy/html/cerefCeWriteFileRAPI.asp