diff --git a/B3ClientService/B3ClientService.csproj b/B3ClientService/B3ClientService.csproj
index 7a5e458..10b4b85 100644
--- a/B3ClientService/B3ClientService.csproj
+++ b/B3ClientService/B3ClientService.csproj
@@ -49,6 +49,7 @@
     </Reference>
     <Reference Include="System" />
     <Reference Include="System.Core" />
+    <Reference Include="System.Web" />
     <Reference Include="System.Web.Extensions" />
     <Reference Include="System.Xml.Linq" />
     <Reference Include="System.Data.DataSetExtensions" />
@@ -119,6 +120,7 @@
     <Compile Include="Rpcs\BillRpc\GradeAndWeightRpc.cs" />
     <Compile Include="Rpcs\BillRpc\WeightBillRpc.cs" />
     <Compile Include="Rpcs\UserInfoRpc.cs" />
+    <Compile Include="Rpcs\VersionRpc.cs" />
     <Compile Include="Tasks\SyncInfoFromServer.cs" />
     <Compile Include="Tasks\UpdateLoad\UploadOrderDetail.cs" />
     <Compile Include="Tasks\UpdateLoad\UploadSecondOrder.cs" />
diff --git a/B3ClientService/Rpcs/VersionRpc.cs b/B3ClientService/Rpcs/VersionRpc.cs
new file mode 100644
index 0000000..1013618
--- /dev/null
+++ b/B3ClientService/Rpcs/VersionRpc.cs
@@ -0,0 +1,38 @@
+using Forks.EnterpriseServices.JsonRpc;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text;
+using System.Web;
+
+namespace BWP.B3ClientService.Rpcs
+{
+  [Rpc]
+  public static class VersionRpc
+  {
+    [Rpc(RpcFlags.SkipAuth)]
+    public static string CheckVersion(string version)
+    {
+      var folder = Path.Combine(HttpRuntime.AppDomainAppPath, "ClientVersion");
+      var versionPath = Path.Combine(folder, "Version.txt");
+      if (File.Exists(versionPath))
+      {
+        if (File.ReadAllText(versionPath) == version)
+          return null;
+        else
+          return GetAllFiles(folder);
+      }
+      return null;
+    }
+
+    static string GetAllFiles(string path)
+    {
+      var list = new List<string>();
+      var folder = new DirectoryInfo(path);
+      foreach (var file in folder.GetFiles())
+        list.Add(file.Name);
+      return string.Join(",", list);
+    }
+  }
+}