diff --git a/shadowsocks-csharp/Controller/Service/AvailabilityStatistics.cs b/shadowsocks-csharp/Controller/Service/AvailabilityStatistics.cs
index 19cf64ad..a6ddc578 100644
--- a/shadowsocks-csharp/Controller/Service/AvailabilityStatistics.cs
+++ b/shadowsocks-csharp/Controller/Service/AvailabilityStatistics.cs
@@ -2,12 +2,20 @@
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
+using System.Net;
+using SimpleJson;
+using System.Net.Http;
 using System.Net.NetworkInformation;
-using System.Threading;
+using System.Threading.Tasks;
+using System.Windows.Forms;
 using Shadowsocks.Model;
+using SimpleJson = SimpleJson.SimpleJson;
+using Timer = System.Threading.Timer;
 
 namespace Shadowsocks.Controller
 {
+    using DataUnit = KeyValuePair<string, string>;
+    using DataList = List<KeyValuePair<string, string>>;
     class AvailabilityStatistics
     {
         private const string StatisticsFilesName = "shadowsocks.availability.csv";
@@ -51,35 +59,67 @@ namespace Shadowsocks.Controller
             }
         }
 
-        private void Evaluate(object obj)
+        //hardcode
+        //TODO: backup reliable isp&geolocation provider or a local database is required
+        private static async Task<DataList> getGeolocationAndISP()
         {
+            Logging.Debug("Retrive information of geolocation and isp");
+            const string api = "http://ip-api.com/json";
+            var jsonString = await new HttpClient().GetStringAsync(api);
+            var ret = new DataList
+            {
+                new DataUnit(State.Geolocation, State.Unknown),
+                new DataUnit(State.ISP, State.Unknown),
+            };
+            dynamic obj;
+            if (!global::SimpleJson.SimpleJson.TryDeserializeObject(jsonString, out obj)) return ret;
+            string country = obj["country"];
+            string city = obj["city"];
+            string isp = obj["isp"];
+            string regionName= obj["regionName"];
+            if (country == null || city == null || isp == null || regionName == null) return ret;
+            ret[0] = new DataUnit(State.Geolocation, $"{country} {regionName} {city}");
+            ret[1] = new DataUnit(State.ISP, isp);
+            return ret;
+        }
+
+        private static async Task<List<DataList>> ICMPTest(Server server)
+        {
+            Logging.Debug("eveluating " + server.FriendlyName());
             var ping = new Ping();
-            var state = (State) obj;
-            foreach (var server in _servers)
+            var ret = new List<DataList>();
+            foreach (var timestamp in Enumerable.Range(0, Repeat).Select(_ => DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss")))
+            {
+                //ICMP echo. we can also set options and special bytes
+                var reply = await ping.SendTaskAsync(server.server, Timeout);
+                ret.Add(new List<KeyValuePair<string, string>>
+                {
+                    new KeyValuePair<string, string>("Timestamp", timestamp),
+                    new KeyValuePair<string, string>("Server", server.FriendlyName()),
+                    new KeyValuePair<string, string>("Status", reply?.Status.ToString()),
+                    new KeyValuePair<string, string>("RoundtripTime", reply?.RoundtripTime.ToString())
+                    //new KeyValuePair<string, string>("data", reply.Buffer.ToString()); // The data of reply
+                });
+            }
+            return ret;
+        }
+
+        private async void Evaluate(object obj)
+        {
+            var geolocationAndIsp = getGeolocationAndISP();
+            foreach (var dataLists in await TaskEx.WhenAll(_servers.Select(ICMPTest)))
             {
-                Logging.Debug("eveluating " + server.FriendlyName());
-                foreach (var _ in Enumerable.Range(0, Repeat))
+                await geolocationAndIsp;
+                foreach (var dataList in dataLists)
                 {
-                    //TODO: do simple analyze of data to provide friendly message, like package loss.
-                    var timestamp = DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss");
-                    //ICMP echo. we can also set options and special bytes
-                    //seems no need to use SendPingAsync：
-                    var reply = ping.Send(server.server, Timeout);
-                    state.Data = new List<KeyValuePair<string, string>>
-                    {
-                        new KeyValuePair<string, string>("Timestamp", timestamp),
-                        new KeyValuePair<string, string>("Server", server.FriendlyName()),
-                        new KeyValuePair<string, string>("Status", reply?.Status.ToString()),
-                        new KeyValuePair<string, string>("RoundtripTime", reply?.RoundtripTime.ToString())
-                    };
-                    //state.data.Add(new KeyValuePair<string, string>("data", reply.Buffer.ToString())); // The data of reply
-                    Append(state.Data);
+                    Append(dataList, geolocationAndIsp.Result);
                 }
             }
         }
 
-        private static void Append(List<KeyValuePair<string, string>> data)
+        private static void Append(DataList dataList, IEnumerable<DataUnit> extra)
         {
+            var data = dataList.Concat(extra);
             var dataLine = string.Join(Delimiter, data.Select(kv => kv.Value).ToArray());
             string[] lines;
             if (!File.Exists(AvailabilityStatisticsFile))
@@ -102,7 +142,10 @@ namespace Shadowsocks.Controller
 
         private class State
         {
-            public List<KeyValuePair<string, string>> Data = new List<KeyValuePair<string, string>>();
+            public DataList dataList = new DataList();
+            public const string Geolocation = "Geolocation";
+            public const string ISP = "ISP";
+            public const string Unknown = "Unknown";
         }
     }
 }
diff --git a/shadowsocks-csharp/app.config b/shadowsocks-csharp/app.config
index 867ff468..a7ba1069 100755
--- a/shadowsocks-csharp/app.config
+++ b/shadowsocks-csharp/app.config
@@ -1,6 +1,19 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="utf-8"?>
 <configuration>
 <startup>
-  <supportedRuntime version="v4.0"/>
-  <supportedRuntime version="v2.0.50727"/>
-</startup></configuration>
+  <supportedRuntime version="v4.0" />
+  <supportedRuntime version="v2.0.50727" />
+</startup>
+  <runtime>
+    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
+      <dependentAssembly>
+        <assemblyIdentity name="System.Runtime" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
+        <bindingRedirect oldVersion="0.0.0.0-2.6.8.0" newVersion="2.6.8.0" />
+      </dependentAssembly>
+      <dependentAssembly>
+        <assemblyIdentity name="System.Threading.Tasks" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
+        <bindingRedirect oldVersion="0.0.0.0-2.6.8.0" newVersion="2.6.8.0" />
+      </dependentAssembly>
+    </assemblyBinding>
+  </runtime>
+</configuration>
diff --git a/shadowsocks-csharp/packages.config b/shadowsocks-csharp/packages.config
new file mode 100644
index 00000000..2dd04b78
--- /dev/null
+++ b/shadowsocks-csharp/packages.config
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<packages>
+  <package id="Microsoft.Bcl" version="1.1.8" targetFramework="net4-client" />
+  <package id="Microsoft.Bcl.Async" version="1.0.168" targetFramework="net4-client" />
+  <package id="Microsoft.Bcl.Build" version="1.0.14" targetFramework="net4-client" />
+</packages>
\ No newline at end of file
diff --git a/shadowsocks-csharp/shadowsocks-csharp.csproj b/shadowsocks-csharp/shadowsocks-csharp.csproj
index 200393d3..832a20c8 100644
--- a/shadowsocks-csharp/shadowsocks-csharp.csproj
+++ b/shadowsocks-csharp/shadowsocks-csharp.csproj
@@ -62,12 +62,39 @@
     <ApplicationManifest>app.manifest</ApplicationManifest>
   </PropertyGroup>
   <ItemGroup>
+    <Reference Include="Microsoft.CSharp" />
+    <Reference Include="Microsoft.Threading.Tasks, Version=1.0.12.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
+      <HintPath>3rd\Microsoft.Bcl.Async.1.0.168\lib\net40\Microsoft.Threading.Tasks.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="Microsoft.Threading.Tasks.Extensions, Version=1.0.12.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
+      <HintPath>3rd\Microsoft.Bcl.Async.1.0.168\lib\net40\Microsoft.Threading.Tasks.Extensions.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="Microsoft.Threading.Tasks.Extensions.Desktop, Version=1.0.168.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
+      <HintPath>3rd\Microsoft.Bcl.Async.1.0.168\lib\net40\Microsoft.Threading.Tasks.Extensions.Desktop.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
     <Reference Include="Microsoft.VisualBasic" />
     <Reference Include="PresentationCore" />
     <Reference Include="PresentationFramework" />
     <Reference Include="System" />
     <Reference Include="System.Data" />
     <Reference Include="System.Drawing" />
+    <Reference Include="System.IO, Version=2.6.8.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
+      <HintPath>3rd\Microsoft.Bcl.1.1.8\lib\net40\System.IO.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="System.Net" />
+    <Reference Include="System.Net.Http, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL" />
+    <Reference Include="System.Runtime, Version=2.6.8.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
+      <HintPath>3rd\Microsoft.Bcl.1.1.8\lib\net40\System.Runtime.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="System.Threading.Tasks, Version=2.6.8.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
+      <HintPath>3rd\Microsoft.Bcl.1.1.8\lib\net40\System.Threading.Tasks.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
     <Reference Include="System.Windows.Forms" />
     <Reference Include="System.Windows.Forms.DataVisualization" />
     <Reference Include="System.Xaml" />
@@ -225,6 +252,7 @@
     <None Include="Data\proxy.pac.txt.gz" />
   </ItemGroup>
   <ItemGroup>
+    <None Include="packages.config" />
     <None Include="Resources\ss20.png" />
     <None Include="Resources\ss16.png" />
     <None Include="Resources\ss24.png" />
@@ -267,6 +295,11 @@
     </BootstrapperPackage>
   </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+  <Import Project="3rd\Microsoft.Bcl.Build.1.0.14\tools\Microsoft.Bcl.Build.targets" Condition="Exists('3rd\Microsoft.Bcl.Build.1.0.14\tools\Microsoft.Bcl.Build.targets')" />
+  <Target Name="EnsureBclBuildImported" BeforeTargets="BeforeBuild" Condition="'$(BclBuildImported)' == ''">
+    <Error Condition="!Exists('3rd\Microsoft.Bcl.Build.1.0.14\tools\Microsoft.Bcl.Build.targets')" Text="This project references NuGet package(s) that are missing on this computer. Enable NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=317567." HelpKeyword="BCLBUILD2001" />
+    <Error Condition="Exists('3rd\Microsoft.Bcl.Build.1.0.14\tools\Microsoft.Bcl.Build.targets')" Text="The build restored NuGet packages. Build the project again to include these packages in the build. For more information, see http://go.microsoft.com/fwlink/?LinkID=317568." HelpKeyword="BCLBUILD2002" />
+  </Target>
   <!-- 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">