Try Sentinel Admin API .NET Class Library Reference

/*
set PATH=c:\Windows\Microsoft.NET\Framework64\v4.0.30319;%PATH%
cls && csc.exe -debug- -target:winexe -platform:x64 -r:sntl_adminapi_net_windows.dll sntl_adminapi_net_windows.cs && sntl_adminapi_net_windows.exe
*/

using System;
//using System.Collections.Generic;
//using System.Text;
//using System.Text.RegularExpressions;
using System.Runtime.InteropServices; // ez a névtér szükséges a DLL-ek miatt
using System.Xml;
using System.IO;
using SafeNet.Sentinel;

public class WinAPI
{
    [DllImport("user32.dll")]
    public static extern int MessageBox(int hWnd, string text, string caption, uint type);
}

namespace TrySentinelLDK
{
    class TrySentinelLDK
    {

        private static AdminApi adminApi;
        private static int vendorId = 00000;

        static void Main(string[] args)
        {
            string scope = "";
            string format = "";
            string info = "";

            adminApi = new AdminApi("localhost", 1947, "");
            AdminStatus rc = default(AdminStatus);

            try
            {
                rc = adminApi.connect();
                //WinAPI.MessageBox(0, "["+rc.ToString()+"]", "MessageBox...", 0);

                scope = "<haspscope>" +
                        " <vendor id=\"" + vendorId + "\" />" +
                        "</haspscope>";

                format = "<admin> <hasp>" +
                        //"  <element name=\"*\" />" +
                        "  <element name=\"haspid\" />" +
                        "</hasp></admin>";

                rc = adminApi.adminGet( scope, format, ref info );
                //Console.WriteLine(info);
                //WinAPI.MessageBox(0, "["+rc.ToString()+"]" + Convert.ToChar(10)+ Convert.ToChar(10) + info, "MessageBox...", 0);

                XmlReader reader = XmlReader.Create(new StringReader(info));
                while (reader.Read())
                {
                    if (reader.NodeType==XmlNodeType.Element && reader.Name == "haspid")
                    {
                        if (reader.Read())
                        //Console.WriteLine("___"+reader.Value+"___");
                        WinAPI.MessageBox(0, reader.Value, "Kulcs sorszám...", 0);
                        break;
                    }
                }
            }
            catch (Exception e)
            {
                Console.WriteLine(e.Message);
            }

            //Console.WriteLine("Press any key to exit.");
            //Console.ReadKey();
        }
    }
}