diff --git a/lib/csharp/test/JSON/JSONTest.csproj b/lib/csharp/test/JSON/JSONTest.csproj
new file mode 100644
index 0000000..f07d43e
--- /dev/null
+++ b/lib/csharp/test/JSON/JSONTest.csproj
@@ -0,0 +1,85 @@
+﻿<?xml version="1.0" encoding="utf-8"?>
+<!--
+  Licensed to the Apache Software Foundation (ASF) under one
+  or more contributor license agreements. See the NOTICE file
+  distributed with this work for additional information
+  regarding copyright ownership. The ASF licenses this file
+  to you under the Apache License, Version 2.0 (the
+  "License"); you may not use this file except in compliance
+  with the License. You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing,
+  software distributed under the License is distributed on an
+  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  KIND, either express or implied. See the License for the
+  specific language governing permissions and limitations
+  under the License.
+-->
+<Project ToolsVersion="4.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">x86</Platform>
+    <ProductVersion>8.0.30703</ProductVersion>
+    <SchemaVersion>2.0</SchemaVersion>
+    <ProjectGuid>{E37A0034-DCBF-4886-A0DA-25A03D12D975}</ProjectGuid>
+    <OutputType>Exe</OutputType>
+    <AppDesignerFolder>Properties</AppDesignerFolder>
+    <RootNamespace>JSONTest</RootNamespace>
+    <AssemblyName>JSONTest</AssemblyName>
+    <TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
+    <TargetFrameworkProfile>
+    </TargetFrameworkProfile>
+    <FileAlignment>512</FileAlignment>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|x86' ">
+    <PlatformTarget>x86</PlatformTarget>
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|x86' ">
+    <PlatformTarget>x86</PlatformTarget>
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="System" />
+    <Reference Include="System.Core" />
+    <Reference Include="System.Xml.Linq" />
+    <Reference Include="System.Data.DataSetExtensions" />
+    <Reference Include="Microsoft.CSharp" />
+    <Reference Include="System.Data" />
+    <Reference Include="System.Xml" />
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="Program.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="app.config" />
+  </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\..\src\Thrift.csproj">
+      <Project>{499EB63C-D74C-47E8-AE48-A2FC94538E9D}</Project>
+      <Name>Thrift</Name>
+    </ProjectReference>
+  </ItemGroup>
+  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+  <!-- To modify your build process, add your task inside one of the targets below and uncomment it.
+       Other similar extension points exist, see Microsoft.Common.targets.
+  <Target Name="BeforeBuild">
+  </Target>
+  <Target Name="AfterBuild">
+  </Target>
+  -->
+</Project>
\ No newline at end of file
diff --git a/lib/csharp/test/JSON/Program.cs b/lib/csharp/test/JSON/Program.cs
new file mode 100644
index 0000000..f61388a
--- /dev/null
+++ b/lib/csharp/test/JSON/Program.cs
@@ -0,0 +1,95 @@
+﻿/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.IO;
+using System.Linq;
+using System.Text;
+using Thrift.Protocol;
+using Thrift.Transport;
+
+namespace JSONTest
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            TestThrift2365();  // JSON binary decodes too much data
+            TestThrift2336();  // hex encoding using \uXXXX where 0xXXXX > 0xFF
+            TestThrift3403(); // JSON escaped unicode surrogate pair support.
+        }
+
+
+        public static void TestThrift2365()
+        {
+            var rnd = new Random();
+            for (var len = 0; len < 10; ++len)
+            {
+                byte[] dataWritten = new byte[len];
+                rnd.NextBytes(dataWritten);
+
+                Stream stm = new MemoryStream();
+                TTransport trans = new TStreamTransport(null, stm);
+                TProtocol prot = new TJSONProtocol(trans);
+                prot.WriteBinary(dataWritten);
+
+                stm.Position = 0;
+                trans = new TStreamTransport(stm, null);
+                prot = new TJSONProtocol(trans);
+                byte[] dataRead = prot.ReadBinary();
+
+                Debug.Assert(dataRead.Length == dataWritten.Length);
+                for (var i = 0; i < dataRead.Length; ++i)
+                    Debug.Assert(dataRead[i] == dataWritten[i]);
+            }
+        }
+
+
+        public static void TestThrift2336()
+        {
+            const string RUSSIAN_TEXT = "\u0420\u0443\u0441\u0441\u043a\u043e\u0435 \u041d\u0430\u0437\u0432\u0430\u043d\u0438\u0435";
+            const string RUSSIAN_JSON = "\"\\u0420\\u0443\\u0441\\u0441\\u043a\\u043e\\u0435 \\u041d\\u0430\\u0437\\u0432\\u0430\\u043d\\u0438\\u0435\"";
+
+            // prepare buffer with JSON data
+            byte[] rawBytes = new byte[RUSSIAN_JSON.Length];
+            for (var i = 0; i < RUSSIAN_JSON.Length; ++i)
+                rawBytes[i] = (byte)(RUSSIAN_JSON[i] & (char)0xFF);  // only low bytes
+
+            // parse and check
+            var stm = new MemoryStream(rawBytes);
+            var trans = new TStreamTransport(stm, null);
+            var prot = new TJSONProtocol(trans);
+            Debug.Assert(prot.ReadString() == RUSSIAN_TEXT, "reading JSON with hex-encoded chars > 8 bit");
+        }
+
+        public static void TestThrift3403()
+        {
+            string GCLEF_TEXT = "\ud834\udd1e";
+            const string GCLEF_JSON = "\"\\ud834\\udd1e\"";
+
+            // parse and check
+            var stm = new MemoryStream(Encoding.UTF8.GetBytes(GCLEF_JSON));
+            var trans = new TStreamTransport(stm, null);
+            var prot = new TJSONProtocol(trans);
+            Debug.Assert(prot.ReadString() == GCLEF_TEXT, "reading JSON with surrogate pair hex-encoded chars");
+        }
+    }
+}
diff --git a/lib/csharp/test/JSON/Properties/AssemblyInfo.cs b/lib/csharp/test/JSON/Properties/AssemblyInfo.cs
new file mode 100644
index 0000000..fdff4a1
--- /dev/null
+++ b/lib/csharp/test/JSON/Properties/AssemblyInfo.cs
@@ -0,0 +1,55 @@
+﻿/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// Allgemeine Informationen über eine Assembly werden über die folgenden
+// Attribute gesteuert. Ändern Sie diese Attributwerte, um die Informationen zu ändern,
+// die mit einer Assembly verknüpft sind.
+[assembly: AssemblyTitle("JSONTest")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("The Apache Software Foundation")]
+[assembly: AssemblyProduct("Thrift")]
+[assembly: AssemblyCopyright("The Apache Software Foundation")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// Durch Festlegen von ComVisible auf "false" werden die Typen in dieser Assembly unsichtbar
+// für COM-Komponenten. Wenn Sie auf einen Typ in dieser Assembly von
+// COM zugreifen müssen, legen Sie das ComVisible-Attribut für diesen Typ auf "true" fest.
+[assembly: ComVisible(false)]
+
+// Die folgende GUID bestimmt die ID der Typbibliothek, wenn dieses Projekt für COM verfügbar gemacht wird
+[assembly: Guid("2b2e7d56-3e65-4368-92d7-e34d56b7105e")]
+
+// Versionsinformationen für eine Assembly bestehen aus den folgenden vier Werten:
+//
+//      Hauptversion
+//      Nebenversion
+//      Buildnummer
+//      Revision
+//
+// Sie können alle Werte angeben oder die standardmäßigen Build- und Revisionsnummern
+// übernehmen, indem Sie "*" eingeben:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]
diff --git a/lib/csharp/test/JSON/app.config b/lib/csharp/test/JSON/app.config
new file mode 100644
index 0000000..9c1919d
--- /dev/null
+++ b/lib/csharp/test/JSON/app.config
@@ -0,0 +1,21 @@
+<?xml version="1.0"?>
+<!--
+  Licensed to the Apache Software Foundation (ASF) under one
+  or more contributor license agreements. See the NOTICE file
+  distributed with this work for additional information
+  regarding copyright ownership. The ASF licenses this file
+  to you under the Apache License, Version 2.0 (the
+  "License"); you may not use this file except in compliance
+  with the License. You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing,
+  software distributed under the License is distributed on an
+  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  KIND, either express or implied. See the License for the
+  specific language governing permissions and limitations
+  under the License.
+-->
+<configuration>
+<startup><supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/></startup></configuration>