C # sends instructions to the same port device to get the status of the same port device

Using system;using system.diagnostics;using system.runtime.interopservices;using system.text;using System.Windows.Forms;        namespace printermonitor{public partial class Form1:form {const UINT GENERIC_READ = 0x80000000;        const UINT GENERIC_WRITE = 0x40000000;         const UINT FILE_ATTRIBUTE_NORMAL = 0x80; #region Win32 API [DllImport ("Kernel32.dll")] private static extern int CreateFile (string lpfil ename, uint dwdesiredaccess, intd wsharemode, int lpsecurityattributes, int DW         Creationdisposition, uint dwflagsandattributes, int htemplatefile); [DllImport ("Kernel32.dll")] private static extern bool WriteFile (int hfile, byte[] lpbuffer , int nnumberofbytestowrite, ref int lpnumberofbyteswritten, int lpoverlapped)         ; [DllImport ("Kernel32.dll")] private static extern BOOL DefineDosDevice (int dwFlags, string lpdevicename, string lptargetpath);        [DllImport ("Kernel32.dll")] private static extern bool CloseHandle (int hobject);             [DllImport ("Kernel32.dll")] private static extern bool ReadFile (int hfile, byte[] lpbuffer,       int nnumberofbytestoread, ref int lpnumberofbytesread, int lpoverlapped);        #endregion public Form1 () {InitializeComponent ();            } private void Button1_Click (object sender, Eventargse) {intihandle =-1;               try {int i = 0;               Create Instance DefineDosDevice (0x00000001, "Lptportname", @ "\device\parallel0"); Ihandle = CreateFile (@ "\\.\lptportname", Generic_read |               Generic_write, 0, 0, 3, file_attribute_normal, 0); if (Ihandle!=-1) {byte[] MyByte = new byte[3]{0x12, 0x14, 0x14};//the command to be sent (16 binary) WriteFile (Ihandle, MyByte, MyByte.                   Length, refi, 0);                   byte[] mybyte1 = new Byte[3];                   String Content= "";                   int j = 0;                   ReadFile (Ihandle, mybyte1, 3, ref j, 0);                            if (mybyte1! = null) {foreach (var tempbyte in mybyte1) {                        Content + = tempbyte.tostring ();               }} MessageBox.Show (content);//Gets the status value}               else {MessageBox.Show ("Failed to create file!"); }} catch (Exception ex) {MessageBox.Show (ex).            Message); } finally {if (Ihandle > 0) {closehandle (Ihandle)               ;      }      }        }    }}  

C # sends instructions to the same port device to get the status of the same port device