using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Diagnostics;
using System.IO;
using System.Management;
using System.Net;
using System.Reflection;
using System.Runtime.InteropServices;
using System.Windows.Forms;
using Microsoft.SqlServer.Management.Smo;
using Microsoft.SqlServer.Management.Smo.RegisteredServers;
using Microsoft.Win32;
using Microsoft.Win32.SafeHandles;
 
 
    [DllImport("kernel32.dll", SetLastError = true)]
    public static extern SafeFileHandle CreateNamedPipe(
       String pipeName,
       uint dwOpenMode,
       uint dwPipeMode,
       uint nMaxInstances,
       uint nOutBufferSize,
       uint nInBufferSize,
       uint nDefaultTimeOut,
       IntPtr lpSecurityAttributes);
    /* -------------------------------------------------------------------- */
    [DllImport("kernel32.dll", SetLastError = true)]
    public static extern int ConnectNamedPipe(
       SafeFileHandle hNamedPipe,
       IntPtr lpOverlapped);
    /* -------------------------------------------------------------------- */
    [DllImport("kernel32.dll", SetLastError = true)]
    public static extern SafeFileHandle CreateFile(
       String pipeName,
       uint dwDesiredAccess,
       uint dwShareMode,
       IntPtr lpSecurityAttributes,
       uint dwCreationDisposition,
       uint dwFlagsAndAttributes,
       IntPtr hTemplate);
 
//Inside a method:
      try
      {
        uint GENERIC_READ = (0x80000000);
        uint GENERIC_WRITE = (0x40000000);
        uint OPEN_EXISTING = 3;
        uint FILE_FLAG_OVERLAPPED = (0x40000000);
 
        SafeFileHandle pipeHandle =
           CreateFile(
              "LPT1",
              GENERIC_READ | GENERIC_WRITE,
              0,
              IntPtr.Zero,
              OPEN_EXISTING,
              FILE_FLAG_OVERLAPPED,
              IntPtr.Zero);
 
        //could not get a handle to the named pipe
        if (pipeHandle.IsInvalid)
          return;
 
        using (FileStream fStream = new FileStream(pipeHandle, FileAccess.Write))
        {
          char cOp = Convert.ToChar(7);
          byte bOp = Convert.ToByte(cOp);
          fStream.WriteByte(bOp);
          fStream.Flush();
          fStream.Close();
        }
      }
      catch { }