diff --git a/ZeroLevel/Services/Network/Contract/IZBackward.cs b/ZeroLevel/Services/Network/Contract/IZBackward.cs
index 8b9f7ef..bfe3ded 100644
--- a/ZeroLevel/Services/Network/Contract/IZBackward.cs
+++ b/ZeroLevel/Services/Network/Contract/IZBackward.cs
@@ -7,5 +7,6 @@ namespace ZeroLevel.Network
         IPEndPoint Endpoint { get; }
 
         void SendBackward(Frame frame);
+        void SendBackward<T>(string inbox, T message);
     }
 }
\ No newline at end of file
diff --git a/ZeroLevel/Services/Network/FileTransfer/BaseFileTransfer.cs b/ZeroLevel/Services/Network/FileTransfer/BaseFileTransfer.cs
new file mode 100644
index 0000000..f583826
--- /dev/null
+++ b/ZeroLevel/Services/Network/FileTransfer/BaseFileTransfer.cs
@@ -0,0 +1,78 @@
+using System;
+using System.Collections.Concurrent;
+using System.IO;
+using System.Threading;
+using ZeroLevel.Network;
+using ZeroLevel.Services.Network.FileTransfer.Model;
+using ZeroLevel.Services.Pools;
+
+namespace ZeroLevel.Services.Network.FileTransfer
+{
+    public abstract class BaseFileTransfer
+    {
+        private readonly FileReceiver _receiver;
+        internal FileReceiver Receiver => _receiver;
+
+        private ObjectPool<FileTransferTask> _taskPool = new ObjectPool<FileTransferTask>(() => new FileTransferTask(), 100);
+        private BlockingCollection<FileTransferTask> _tasks = new BlockingCollection<FileTransferTask>();
+        private readonly Thread _uploadFileThread;
+        /*private int _maxParallelFileTransfer;
+        private int _currentFileTransfers;*/
+
+        internal BaseFileTransfer(string baseFolder/*,  int maxParallelFileTransfer = 6*/)
+        {
+            _receiver = new FileReceiver(baseFolder);
+            _uploadFileThread = new Thread(UploadFileProcessing);
+            _uploadFileThread.IsBackground = true;
+            _uploadFileThread.Start();
+            /*_maxParallelFileTransfer = maxParallelFileTransfer;
+            _currentFileTransfers = 0;*/
+        }
+
+        protected void PushTransferTask(string filePath, Action<string> completeHandler = null, Action<string, string> errorHandler = null, IZBackward client = null)
+        {
+            if (string.IsNullOrWhiteSpace(filePath))
+            {
+                throw new ArgumentNullException(nameof(filePath));
+            }
+            if (false == File.Exists(filePath))
+            {
+                throw new FileNotFoundException(filePath);
+            }
+            var task = _taskPool.Allocate();
+            task.CompletedHandler = completeHandler;
+            task.ErrorHandler = errorHandler;
+            task.FilePath = filePath;
+            task.Client = client;
+            _tasks.Add(task);
+        }
+
+        private void UploadFileProcessing()
+        {
+            while (true)
+            {
+                var task = _tasks.Take();
+                try
+                {
+                    ExecuteSendFile(GetReaderFor(task.FilePath), task);
+                    task.CompletedHandler?.Invoke(task.FilePath);
+                }
+                catch (Exception ex)
+                {
+                    task.ErrorHandler?.Invoke(task.FilePath, ex.ToString());
+                }
+                finally
+                {
+                    _taskPool.Free(task);
+                }
+            }
+        }
+
+        internal abstract void ExecuteSendFile(FileReader reader, FileTransferTask task);
+
+        private FileReader GetReaderFor(string filePath)
+        {
+            return new FileReader(filePath);
+        }
+    }
+}
diff --git a/ZeroLevel/Services/Network/FileTransfer/ClientFolderNameMapperDelegate.cs b/ZeroLevel/Services/Network/FileTransfer/ClientFolderNameMapperDelegate.cs
new file mode 100644
index 0000000..81b5e26
--- /dev/null
+++ b/ZeroLevel/Services/Network/FileTransfer/ClientFolderNameMapperDelegate.cs
@@ -0,0 +1,6 @@
+using ZeroLevel.Network;
+
+namespace ZeroLevel.Services.Network.FileTransfer
+{
+    public delegate string ClientFolderNameMapper(IExClient client);
+}
diff --git a/ZeroLevel/Services/Network/FileTransfer/FileClient.cs b/ZeroLevel/Services/Network/FileTransfer/FileClient.cs
new file mode 100644
index 0000000..cd57903
--- /dev/null
+++ b/ZeroLevel/Services/Network/FileTransfer/FileClient.cs
@@ -0,0 +1,52 @@
+using System;
+using System.IO;
+using ZeroLevel.Network;
+using ZeroLevel.Services.Network.FileTransfer.Model;
+
+namespace ZeroLevel.Services.Network.FileTransfer
+{
+    public sealed class FileClient
+        : BaseFileTransfer, IFileClient
+    {
+        private readonly IExClient _client;
+        private readonly string _baseFolder;
+        private readonly ClientFolderNameMapper _nameMapper;
+        private readonly bool _disposeClient;
+
+        internal FileClient(IExClient client, string baseFolder, ClientFolderNameMapper nameMapper, bool disposeClient)
+            : base(baseFolder)
+        {
+            _client = client ?? throw new Exception(nameof(client));
+            _baseFolder = baseFolder ?? throw new Exception(nameof(baseFolder));
+            _nameMapper = nameMapper ?? throw new Exception(nameof(nameMapper));
+            _disposeClient = disposeClient;
+        }
+
+        public void Dispose()
+        {
+            if (_disposeClient)
+            {
+                _client?.Dispose();
+            }
+        }
+
+        public void Send(string fileName, Action<string> completeHandler = null, Action<string, string> errorHandler = null)
+        {
+            PushTransferTask(fileName, completeHandler, errorHandler);
+        }
+
+        internal override void ExecuteSendFile(FileReader reader, FileTransferTask task)
+        {
+            Log.Info($"Start upload file {reader.Path}");
+            var startinfo = reader.GetStartInfo();
+            startinfo.FilePath = Path.GetFileName(startinfo.FilePath);
+            _client.Send("__upload_file_start", startinfo);
+            foreach (var chunk in reader.Read())
+            {
+                _client.Send("__upload_file_frame", chunk);
+            }
+            _client.Send("__upload_file_complete", reader.GetCompleteInfo());
+            Log.Info($"Stop upload file {reader.Path}");
+        }
+    }
+}
diff --git a/ZeroLevel/Services/Network/FileTransfer/FileClientFactory.cs b/ZeroLevel/Services/Network/FileTransfer/FileClientFactory.cs
new file mode 100644
index 0000000..522e720
--- /dev/null
+++ b/ZeroLevel/Services/Network/FileTransfer/FileClientFactory.cs
@@ -0,0 +1,24 @@
+using ZeroLevel.Network;
+using ZeroLevel.Services.FileSystem;
+
+namespace ZeroLevel.Services.Network.FileTransfer
+{
+    public static class FileClientFactory
+    {
+        public static IFileClient Create(string serverEndpoint, string baseFolder, ClientFolderNameMapper nameMapper = null)
+        {
+            return CreateFileServerClient(ExchangeTransportFactory.GetClient(serverEndpoint), baseFolder,
+                nameMapper ?? (c => FSUtils.FileNameCorrection($"{c.Endpoint.Address}_{c.Endpoint.Port}")), true);
+        }
+
+        public static IFileClient Create(IExClient client, string baseFolder, ClientFolderNameMapper nameMapper = null)
+        {
+            return CreateFileServerClient(client, baseFolder, nameMapper ?? (c => FSUtils.FileNameCorrection($"{c.Endpoint.Address}_{c.Endpoint.Port}")), false);
+        }
+
+        private static IFileClient CreateFileServerClient(IExClient client, string baseFolder, ClientFolderNameMapper nameMapper, bool disposeClient)
+        {
+            return new FileClient(client, baseFolder, nameMapper, disposeClient);
+        }
+    }
+}
diff --git a/ZeroLevel/Services/Network/FileTransfer/FileReader.cs b/ZeroLevel/Services/Network/FileTransfer/FileReader.cs
new file mode 100644
index 0000000..d275fbc
--- /dev/null
+++ b/ZeroLevel/Services/Network/FileTransfer/FileReader.cs
@@ -0,0 +1,53 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using ZeroLevel.Services.Network.FileTransfer.Model;
+
+namespace ZeroLevel.Services.Network.FileTransfer
+{
+    internal sealed class FileReader
+    {
+        private readonly FileStartFrame _startInfo;
+        public string Path { get; }
+        private const int CHUNK_SIZE = 512 * 1024;
+
+        public FileReader(string path)
+        {
+            Path = path;
+            _startInfo = FileStartFrame.GetTransferFileInfo(path);
+        }
+
+        public FileStartFrame GetStartInfo()
+        {
+            return _startInfo;
+        }
+
+        public IEnumerable<FileFrame> Read()
+        {
+            long offset = 0;
+            using (FileStream stream = new FileStream(Path, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
+            {
+                int bytesRead;
+                var buffer = new byte[CHUNK_SIZE];
+                while ((bytesRead = stream.Read(buffer, 0, buffer.Length)) > 0)
+                {
+                    var fragment = new FileFrame
+                    {
+                        UploadTaskId = _startInfo.FileUploadTaskId,
+                        Offset = offset * CHUNK_SIZE,
+                        Payload = new byte[bytesRead]
+                    };
+                    Array.Copy(buffer, 0, fragment.Payload, 0, bytesRead);
+                    offset = offset + 1;
+                    yield return fragment;
+                }
+            }
+            GC.Collect();
+        }
+
+        public FileEndFrame GetCompleteInfo()
+        {
+            return new FileEndFrame { FileUploadTaskId = _startInfo.FileUploadTaskId };
+        }
+    }
+}
diff --git a/ZeroLevel/Services/Network/FileTransfer/FileReceiver.cs b/ZeroLevel/Services/Network/FileTransfer/FileReceiver.cs
new file mode 100644
index 0000000..c9a13d3
--- /dev/null
+++ b/ZeroLevel/Services/Network/FileTransfer/FileReceiver.cs
@@ -0,0 +1,132 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using ZeroLevel.Services.Network.FileTransfer.Model;
+
+namespace ZeroLevel.Services.Network.FileTransfer
+{
+    public class FileReceiver
+    {
+        private class FileWriter
+            : IDisposable
+        {
+            private readonly FileStream _stream;
+            internal DateTime _writeTime { get; private set; } = DateTime.UtcNow;
+
+            public FileWriter(string path)
+            {
+                _stream = new FileStream(path, FileMode.Create, FileAccess.Write, FileShare.None);
+            }
+
+            public void Write(long offset, byte[] data)
+            {
+                _stream.Position = offset;
+                _stream.Write(data, 0, data.Length);
+                _writeTime = DateTime.Now;
+            }
+
+            public bool IsTimeoutBy(TimeSpan period)
+            {
+                return (DateTime.Now - _writeTime) > period;
+            }
+
+            public void Dispose()
+            {
+                _stream.Flush();
+                _stream.Close();
+                _stream.Dispose();
+            }
+        }
+        private string _basePath;
+        private string _disk_prefix;
+
+        private readonly Dictionary<int, FileWriter> _incoming = new Dictionary<int, FileWriter>();
+        private readonly object _locker = new object();
+        private long _cleanErrorsTaskId;
+
+        public FileReceiver(string path, string disk_prefix = "DRIVE_")
+        {
+            _disk_prefix = disk_prefix;
+            _basePath = path;
+            _cleanErrorsTaskId = Sheduller.RemindEvery(TimeSpan.FromMinutes(1), CleanBadFiles);
+        }
+
+
+        private void CleanBadFiles()
+        {
+            lock (_locker)
+            {
+                foreach (var pair in _incoming)
+                {
+                    if (pair.Value.IsTimeoutBy(TimeSpan.FromMinutes(3)))
+                    {
+                        Remove(pair.Key);
+                    }
+                }
+            }
+        }
+
+        public void Incoming(FileStartFrame info, string clientFolderName)
+        {
+            if (false == _incoming.ContainsKey(info.FileUploadTaskId))
+            {
+                lock (_locker)
+                {
+                    if (false == _incoming.ContainsKey(info.FileUploadTaskId))
+                    {
+                        string path = BuildFilePath(clientFolderName, info.FilePath);
+                        _incoming.Add(info.FileUploadTaskId, new FileWriter(path));
+                    }
+                }
+            }
+        }
+
+        public void Incoming(FileFrame chunk)
+        {
+            FileWriter stream;
+            if (_incoming.TryGetValue(chunk.UploadTaskId, out stream))
+            {
+                stream.Write(chunk.Offset, chunk.Payload);
+            }
+        }
+
+        public void Incoming(FileEndFrame info)
+        {
+            lock (_locker)
+            {
+                Remove(info.FileUploadTaskId);
+            }
+        }
+
+        private void Remove(int uploadTaskId)
+        {
+            FileWriter stream;
+            if (_incoming.TryGetValue(uploadTaskId, out stream))
+            {
+                _incoming.Remove(uploadTaskId);
+                stream?.Dispose();
+            }
+        }
+
+        private string BuildFilePath(string client_folder_name, string clientPath)
+        {
+            if (string.IsNullOrEmpty(client_folder_name))
+            {
+                if (false == Directory.Exists(_basePath))
+                {
+                    Directory.CreateDirectory(_basePath);
+                }
+                return Path.Combine(_basePath, Path.GetFileName(clientPath));
+            }
+            else
+            {
+                string folder = Path.Combine(Path.Combine(_basePath, client_folder_name), Path.GetDirectoryName(clientPath).Replace(":", "_DRIVE"));
+                if (false == System.IO.Directory.Exists(folder))
+                {
+                    System.IO.Directory.CreateDirectory(folder);
+                }
+                return Path.Combine(folder, Path.GetFileName(clientPath));
+            }
+        }
+    }
+}
diff --git a/ZeroLevel/Services/Network/FileTransfer/FileServer.cs b/ZeroLevel/Services/Network/FileTransfer/FileServer.cs
new file mode 100644
index 0000000..d4f0183
--- /dev/null
+++ b/ZeroLevel/Services/Network/FileTransfer/FileServer.cs
@@ -0,0 +1,52 @@
+using System;
+using System.IO;
+using ZeroLevel.Network;
+using ZeroLevel.Services.Network.FileTransfer.Model;
+
+namespace ZeroLevel.Services.Network.FileTransfer
+{
+    public sealed class FileServer
+        : BaseFileTransfer, IFileServer
+    {
+        private readonly IExService _service;
+        private readonly string _baseFolder;
+        private readonly ServerFolderNameMapperDelegate _nameMapper;
+        private readonly bool _disposeService;
+
+        internal FileServer(IExService service, string baseFolder, ServerFolderNameMapperDelegate nameMapper, bool disposeService)
+            : base(baseFolder)
+        {
+            _service = service ?? throw new Exception(nameof(service));
+            _baseFolder = baseFolder ?? throw new Exception(nameof(baseFolder));
+            _nameMapper = nameMapper ?? throw new Exception(nameof(nameMapper));
+            _disposeService = disposeService;
+        }
+
+        public void Dispose()
+        {
+            if (_disposeService)
+            {
+                _service?.Dispose();
+            }
+        }
+
+        public void Send(IZBackward client, string fileName, Action<string> completeHandler = null, Action<string, string> errorHandler = null)
+        {
+            PushTransferTask(fileName, completeHandler, errorHandler, client);
+        }
+
+        internal override void ExecuteSendFile(FileReader reader, FileTransferTask task)
+        {
+            Log.Info($"Start upload file {reader.Path}");
+            var startinfo = reader.GetStartInfo();
+            startinfo.FilePath = Path.GetFileName(startinfo.FilePath);
+            task.Client.SendBackward("__upload_file_start", startinfo);
+            foreach (var chunk in reader.Read())
+            {
+                task.Client.SendBackward("__upload_file_frame", chunk);
+            }
+            task.Client.SendBackward("__upload_file_complete", reader.GetCompleteInfo());
+            Log.Info($"Stop upload file {reader.Path}");
+        }
+    }
+}
diff --git a/ZeroLevel/Services/Network/FileTransfer/FileServerFactory.cs b/ZeroLevel/Services/Network/FileTransfer/FileServerFactory.cs
new file mode 100644
index 0000000..8176301
--- /dev/null
+++ b/ZeroLevel/Services/Network/FileTransfer/FileServerFactory.cs
@@ -0,0 +1,23 @@
+using ZeroLevel.Network;
+using ZeroLevel.Services.FileSystem;
+
+namespace ZeroLevel.Services.Network.FileTransfer
+{
+    public static class FileServerFactory
+    {
+        public static IFileServer Create(int port, string baseFolder, ServerFolderNameMapperDelegate nameMapper = null)
+        {
+            return CreateFileServer(ExchangeTransportFactory.GetServer(port), baseFolder, nameMapper ?? (c => FSUtils.FileNameCorrection($"{c.Endpoint.Address}_{c.Endpoint.Port}")), true);
+        }
+
+        public static IFileServer Create(IExService service, string baseFolder, ServerFolderNameMapperDelegate nameMapper = null)
+        {
+            return CreateFileServer(service, baseFolder, nameMapper ?? (c => FSUtils.FileNameCorrection($"{c.Endpoint.Address}_{c.Endpoint.Port}")), false);
+        }
+
+        private static IFileServer CreateFileServer(IExService service, string baseFolder, ServerFolderNameMapperDelegate nameMapper, bool disposeService)
+        {
+            return new FileServer(service, baseFolder, nameMapper, disposeService);
+        }
+    }
+}
diff --git a/ZeroLevel/Services/Network/FileTransfer/IFileClient.cs b/ZeroLevel/Services/Network/FileTransfer/IFileClient.cs
new file mode 100644
index 0000000..507e16f
--- /dev/null
+++ b/ZeroLevel/Services/Network/FileTransfer/IFileClient.cs
@@ -0,0 +1,10 @@
+using System;
+
+namespace ZeroLevel.Services.Network.FileTransfer
+{
+    public interface IFileClient
+        : IDisposable
+    {
+        void Send(string fileName, Action<string> completeHandler = null, Action<string, string> errorHandler = null);
+    }
+}
diff --git a/ZeroLevel/Services/Network/FileTransfer/IFileServer.cs b/ZeroLevel/Services/Network/FileTransfer/IFileServer.cs
new file mode 100644
index 0000000..4355dde
--- /dev/null
+++ b/ZeroLevel/Services/Network/FileTransfer/IFileServer.cs
@@ -0,0 +1,11 @@
+using System;
+using ZeroLevel.Network;
+
+namespace ZeroLevel.Services.Network.FileTransfer
+{
+    public interface IFileServer
+        : IDisposable
+    {
+        void Send(IZBackward client, string fileName, Action<string> completeHandler = null, Action<string, string> errorHandler = null);
+    }
+}
diff --git a/ZeroLevel/Services/Network/FileTransfer/Model/FileEndFrame.cs b/ZeroLevel/Services/Network/FileTransfer/Model/FileEndFrame.cs
new file mode 100644
index 0000000..e6ef3e9
--- /dev/null
+++ b/ZeroLevel/Services/Network/FileTransfer/Model/FileEndFrame.cs
@@ -0,0 +1,20 @@
+using ZeroLevel.Services.Serialization;
+
+namespace ZeroLevel.Services.Network.FileTransfer.Model
+{
+    public sealed class FileEndFrame
+        : IBinarySerializable
+    {
+        public int FileUploadTaskId;
+
+        public void Serialize(IBinaryWriter writer)
+        {
+            writer.WriteInt32(this.FileUploadTaskId);
+        }
+
+        public void Deserialize(IBinaryReader reader)
+        {
+            this.FileUploadTaskId = reader.ReadInt32();
+        }
+    }
+}
diff --git a/ZeroLevel/Services/Network/FileTransfer/Model/FileFrame.cs b/ZeroLevel/Services/Network/FileTransfer/Model/FileFrame.cs
new file mode 100644
index 0000000..2eb52dd
--- /dev/null
+++ b/ZeroLevel/Services/Network/FileTransfer/Model/FileFrame.cs
@@ -0,0 +1,26 @@
+using ZeroLevel.Services.Serialization;
+
+namespace ZeroLevel.Services.Network.FileTransfer.Model
+{
+    public sealed class FileFrame :
+        IBinarySerializable
+    {
+        public int UploadTaskId { get; set; }
+        public long Offset { get; set; }
+        public byte[] Payload { get; set; }
+
+        public void Serialize(IBinaryWriter writer)
+        {
+            writer.WriteInt32(this.UploadTaskId);
+            writer.WriteLong(this.Offset);
+            writer.WriteBytes(this.Payload);
+        }
+
+        public void Deserialize(IBinaryReader reader)
+        {
+            this.UploadTaskId = reader.ReadInt32();
+            this.Offset = reader.ReadLong();
+            this.Payload = reader.ReadBytes();
+        }
+    }
+}
diff --git a/ZeroLevel/Services/Network/FileTransfer/Model/FileStartFrame.cs b/ZeroLevel/Services/Network/FileTransfer/Model/FileStartFrame.cs
new file mode 100644
index 0000000..957d65f
--- /dev/null
+++ b/ZeroLevel/Services/Network/FileTransfer/Model/FileStartFrame.cs
@@ -0,0 +1,40 @@
+using System.Threading;
+using ZeroLevel.Services.Serialization;
+
+namespace ZeroLevel.Services.Network.FileTransfer.Model
+{
+    public sealed class FileStartFrame
+        : IBinarySerializable
+    {
+        private static int _uploadTaskIdCounter = 0;
+
+        public int FileUploadTaskId;
+        public string FilePath;
+        public long Size;
+
+        public void Serialize(IBinaryWriter writer)
+        {
+            writer.WriteInt32(this.FileUploadTaskId);
+            writer.WriteString(this.FilePath);
+            writer.WriteLong(this.Size);
+        }
+
+        public void Deserialize(IBinaryReader reader)
+        {
+            this.FileUploadTaskId = reader.ReadInt32();
+            this.FilePath = reader.ReadString();
+            this.Size = reader.ReadLong();
+        }
+
+        public static FileStartFrame GetTransferFileInfo(string path)
+        {
+            var fi = new System.IO.FileInfo(path);
+            return new FileStartFrame
+            {
+                FilePath = fi.FullName,
+                FileUploadTaskId = Interlocked.Increment(ref _uploadTaskIdCounter),
+                Size = fi.Length
+            };
+        }
+    }
+}
diff --git a/ZeroLevel/Services/Network/FileTransfer/Model/FileTransferTask.cs b/ZeroLevel/Services/Network/FileTransfer/Model/FileTransferTask.cs
new file mode 100644
index 0000000..a61084c
--- /dev/null
+++ b/ZeroLevel/Services/Network/FileTransfer/Model/FileTransferTask.cs
@@ -0,0 +1,13 @@
+using System;
+using ZeroLevel.Network;
+
+namespace ZeroLevel.Services.Network.FileTransfer.Model
+{
+    internal class FileTransferTask
+    {
+        public string FilePath;
+        public Action<string> CompletedHandler;
+        public Action<string, string> ErrorHandler;
+        public IZBackward Client;
+    }
+}
diff --git a/ZeroLevel/Services/Network/FileTransfer/ServerFolderNameMapperDelegate.cs b/ZeroLevel/Services/Network/FileTransfer/ServerFolderNameMapperDelegate.cs
new file mode 100644
index 0000000..27e8417
--- /dev/null
+++ b/ZeroLevel/Services/Network/FileTransfer/ServerFolderNameMapperDelegate.cs
@@ -0,0 +1,6 @@
+using ZeroLevel.Network;
+
+namespace ZeroLevel.Services.Network.FileTransfer
+{
+    public delegate string ServerFolderNameMapperDelegate(IZBackward connection);
+}
diff --git a/ZeroLevel/Services/Network/Services/ExClient.cs b/ZeroLevel/Services/Network/Services/ExClient.cs
index 8798f56..7afc76a 100644
--- a/ZeroLevel/Services/Network/Services/ExClient.cs
+++ b/ZeroLevel/Services/Network/Services/ExClient.cs
@@ -105,5 +105,10 @@ namespace ZeroLevel.Network
         {
             _fe.Send(frame);
         }
+
+        public void SendBackward<T>(string inbox, T obj)
+        {
+            Send(inbox, obj);
+        }
     }
 }
\ No newline at end of file
diff --git a/ZeroLevel/Services/Network/ZSocketServerClient.cs b/ZeroLevel/Services/Network/ZSocketServerClient.cs
index 7805942..3380d4e 100644
--- a/ZeroLevel/Services/Network/ZSocketServerClient.cs
+++ b/ZeroLevel/Services/Network/ZSocketServerClient.cs
@@ -205,5 +205,26 @@ namespace ZeroLevel.Network
             if (other == null) return false;
             return this.Endpoint.Compare(other.Endpoint) == 0;
         }
+
+        public void SendBackward<T>(string inbox, T message)
+        {
+            var frame = FrameBuilder.BuildFrame<T>(message, inbox);
+            if (Status == ZTransportStatus.Working && false == _send_queue.IsCompleted && false == _send_queue.IsAddingCompleted)
+            {
+                var data = MessageSerializer.Serialize(frame);
+                try
+                {
+                    _send_queue.Add(NetworkStreamFastObfuscator.PrepareData(data));
+                }
+                catch (ObjectDisposedException)
+                {
+                    // Ignore
+                }
+                finally
+                {
+                    frame?.Release();
+                }
+            }
+        }
     }
 }
\ No newline at end of file
diff --git a/ZeroLevel/ZeroLevel.csproj b/ZeroLevel/ZeroLevel.csproj
index 2d8122e..c825a81 100644
--- a/ZeroLevel/ZeroLevel.csproj
+++ b/ZeroLevel/ZeroLevel.csproj
@@ -5,15 +5,15 @@
     <Description>Infrastructure layer library</Description>
     <Authors>ogoun</Authors>
     <Company>ogoun</Company>
-    <AssemblyVersion>2.0.4.0</AssemblyVersion>
-    <PackageReleaseNotes>IDXReader, SoftMax function</PackageReleaseNotes>
+    <AssemblyVersion>2.0.6.0</AssemblyVersion>
+    <PackageReleaseNotes>File client/server</PackageReleaseNotes>
     <PackageProjectUrl>https://github.com/ogoun/Zero/wiki</PackageProjectUrl>
     <Copyright>Copyright Ogoun 2019</Copyright>
     <PackageLicenseUrl>https://opensource.org/licenses/MIT</PackageLicenseUrl>
     <PackageIconUrl>https://raw.githubusercontent.com/ogoun/Zero/master/zero.png</PackageIconUrl>
     <RepositoryUrl>https://github.com/ogoun/Zero</RepositoryUrl>
     <RepositoryType>GitHub</RepositoryType>
-    <Version>2.0.5</Version>
+    <Version>2.0.6</Version>
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">