.NET (Core and Framework)

using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;
using System.Globalization;
using NetScan.Contract;
using System.Diagnostics;

namespace NetScan.Service
{
   static class NetBios
   {
      #region public

      public class Info
      {
         private Info()
         {
         }
         internal Info(PlatformId platformId, Version version, string computerName, string lanGroup)
         {
            this.PlatformId = platformId;
            this.Version = version;
            this.ComputerName = computerName;
            this.LanGroup = lanGroup;
         }
         public readonly PlatformId PlatformId;
         public readonly Version Version;
         public readonly string ComputerName;
         public readonly string LanGroup;

         public string Comment;
         public ServerType ServerType;

         public override string ToString()
         {
            return string.Format(CultureInfo.CurrentCulture, "{0} - {1} - {2}", Version, ComputerName, LanGroup);
         }
      }

      public static Info GetInfo(string serverName)
      {
         Info retVal = null;
         System.IntPtr x;
         uint lret = NativeMethods.NetWkstaGetInfo(serverName, 100, out x);
         if (lret != 0 || x == System.IntPtr.Zero)
         {
            return null;
         }
         NativeMethods.WKSTA_INFO_100 wi = (NativeMethods.WKSTA_INFO_100)Marshal.PtrToStructure(x, typeof(NativeMethods.WKSTA_INFO_100));
         retVal = new Info((PlatformId)wi.wki100_platform_id, new Version(wi.wki100_ver_major, wi.wki100_ver_minor), Marshal.PtrToStringUni(wi.wki100_computername), Marshal.PtrToStringUni(wi.wki100_langroup));
         NativeMethods.NetApiBufferFree(x);

         lret = NativeMethods.NetServerGetInfo(serverName, 101, out x);
         if (lret == 0 && x != System.IntPtr.Zero)
         {
            NativeMethods.SERVER_INFO_101 si = (NativeMethods.SERVER_INFO_101)Marshal.PtrToStructure(x, typeof(NativeMethods.SERVER_INFO_101));
            retVal.Comment = Marshal.PtrToStringUni(si.sv101_comment);
            retVal.ServerType = (ServerType)si.sv101_type;
            NativeMethods.NetApiBufferFree(x);
         }

         return retVal;
      }

      #endregion

      private static class NativeMethods
      {
         internal enum PlatformId : int
         {
            PLATFORM_ID_DOS = 300,
            PLATFORM_ID_OS2 = 400,
            PLATFORM_ID_NT = 500,
            PLATFORM_ID_OSF = 600,
            PLATFORM_ID_VMS = 700,
         }

         [Flags]
         internal enum SVType : uint
         {
            SV_TYPE_WORKSTATION = 0x00000001,
            SV_TYPE_SERVER = 0x00000002,
            SV_TYPE_SQLSERVER = 0x00000004,
            SV_TYPE_DOMAIN_CTRL = 0x00000008,
            SV_TYPE_DOMAIN_BAKCTRL = 0x00000010,
            SV_TYPE_TIME_SOURCE = 0x00000020,
            SV_TYPE_AFP = 0x00000040,
            SV_TYPE_NOVELL = 0x00000080,
            SV_TYPE_DOMAIN_MEMBER = 0x00000100,
            SV_TYPE_PRINTQ_SERVER = 0x00000200,
            SV_TYPE_DIALIN_SERVER = 0x00000400,
            SV_TYPE_XENIX_SERVER = 0x00000800,
            SV_TYPE_SERVER_UNIX = SV_TYPE_XENIX_SERVER,
            SV_TYPE_NT = 0x00001000,
            SV_TYPE_WFW = 0x00002000,
            SV_TYPE_SERVER_MFPN = 0x00004000,
            SV_TYPE_SERVER_NT = 0x00008000,
            SV_TYPE_POTENTIAL_BROWSER = 0x00010000,
            SV_TYPE_BACKUP_BROWSER = 0x00020000,
            SV_TYPE_MASTER_BROWSER = 0x00040000,
            SV_TYPE_DOMAIN_MASTER = 0x00080000,
            SV_TYPE_SERVER_OSF = 0x00100000,
            SV_TYPE_SERVER_VMS = 0x00200000,
            SV_TYPE_WINDOWS = 0x00400000, // Windows95 and above
            SV_TYPE_DFS = 0x00800000, // Root of a DFS tree
            SV_TYPE_CLUSTER_NT = 0x01000000, // NT Cluster
            SV_TYPE_TERMINALSERVER = 0x02000000, // Terminal Server(Hydra)
            SV_TYPE_CLUSTER_VS_NT = 0x04000000, // NT Cluster Virtual Server Name
            SV_TYPE_DCE = 0x10000000, // IBM DSS (Directory and Security Services) or equivalent
            SV_TYPE_ALTERNATE_XPORT = 0x20000000, // return list for alternate transport
            SV_TYPE_LOCAL_LIST_ONLY = 0x40000000, // Return local list only
            SV_TYPE_DOMAIN_ENUM = 0x80000000,
            SV_TYPE_ALL = 0xFFFFFFFF, /* handy for NetServerEnum2 */
         }


         [StructLayout(LayoutKind.Sequential)]
         internal struct WKSTA_INFO_100
         {
            public PlatformId wki100_platform_id;
            public IntPtr wki100_computername;
            public IntPtr wki100_langroup;
            public int wki100_ver_major;
            public int wki100_ver_minor;
         }

         [StructLayout(LayoutKind.Sequential)]
         public struct WKSTA_INFO_101
         {
            public PlatformId wki101_platform_id;
            public IntPtr wki101_computername;
            public IntPtr wki101_langroup;
            public int wki101_ver_major;
            public int wki101_ver_minor;
            public IntPtr wki101_lanroot;
         }

         [StructLayout(LayoutKind.Sequential)]
         public struct SERVER_INFO_100
         {
            public PlatformId sv100_platform_id;
            public IntPtr sv100_name;
         }

         [StructLayout(LayoutKind.Sequential)]
         public struct SERVER_INFO_101
         {
            public PlatformId sv101_platform_id;
            public IntPtr sv101_name;
            public uint sv101_version_major;
            public uint sv101_version_minor;
            public SVType sv101_type;
            public IntPtr sv101_comment;
         }

         [DllImport("netapi32.dll", CharSet = CharSet.Auto, SetLastError = true)]
         internal static extern int NetApiBufferFree(System.IntPtr pBuffer);

         [DllImport("netapi32.dll", CharSet = CharSet.Auto, SetLastError = true)]
         internal static extern uint NetServerGetInfo([MarshalAs(UnmanagedType.LPWStr)] string serverName, int level, out IntPtr Buffer);

         [DllImport("netapi32.dll", CharSet = CharSet.Auto, SetLastError = true)]
         internal static extern uint NetWkstaGetInfo([MarshalAs(UnmanagedType.LPWStr)] string serverName, int level, out IntPtr Buffer);
      }

   }
}