不要在.NET中：

http://support.microsoft.com/kb/105763

#include <windows.h>
   #include <stdio.h>

   void main( )
   {
      HANDLE hFile, hStream;
      DWORD dwRet;

      hFile = CreateFile( "testfile",
                       GENERIC_WRITE,
                    FILE_SHARE_WRITE,
                                NULL,
                         OPEN_ALWAYS,
                                   0,
                                NULL );
      if( hFile == INVALID_HANDLE_VALUE )
         printf( "Cannot open testfile\n" );
      else
          WriteFile( hFile, "This is testfile", 16, &dwRet, NULL );

      hStream = CreateFile( "testfile:stream",
                                GENERIC_WRITE,
                             FILE_SHARE_WRITE,
                                         NULL,
                                  OPEN_ALWAYS,
                                            0,
                                         NULL );
      if( hStream == INVALID_HANDLE_VALUE )
         printf( "Cannot open testfile:stream\n" );
      else
         WriteFile(hStream, "This is testfile:stream", 23, &dwRet, NULL);
   }