diff --git a/shadowsocks-csharp/Controller/Service/IPCService.cs b/shadowsocks-csharp/Controller/Service/IPCService.cs
new file mode 100644
index 00000000..5e32f4aa
--- /dev/null
+++ b/shadowsocks-csharp/Controller/Service/IPCService.cs
@@ -0,0 +1,88 @@
+using System;
+using System.IO.Pipes;
+using System.Net;
+using System.Text;
+
+namespace Shadowsocks.Controller
+{
+    class RequestAddUrlEventArgs : EventArgs
+    {
+        public readonly string Url;
+
+        public RequestAddUrlEventArgs(string url)
+        {
+            this.Url = url;
+        }
+    }
+
+    internal class IPCService
+    {
+        private const int INT32_LEN = 4;
+        private const int OP_OPEN_URL = 1;
+        private static readonly string PIPE_PATH = $"Shadowsocks\\{Program.ExecutablePath.GetHashCode()}";
+
+        public event EventHandler<RequestAddUrlEventArgs> OpenUrlRequested;
+
+        public async void RunServer()
+        {
+            byte[] buf = new byte[4096];
+            while (true)
+            {
+                using (NamedPipeServerStream stream = new NamedPipeServerStream(PIPE_PATH))
+                {
+                    await stream.WaitForConnectionAsync();
+                    await stream.ReadAsync(buf, 0, INT32_LEN);
+                    int opcode = IPAddress.NetworkToHostOrder(BitConverter.ToInt32(buf, 0));
+                    if (opcode == OP_OPEN_URL)
+                    {
+                        await stream.ReadAsync(buf, 0, INT32_LEN);
+                        int strlen = IPAddress.NetworkToHostOrder(BitConverter.ToInt32(buf, 0));
+
+                        await stream.ReadAsync(buf, 0, strlen);
+                        string url = Encoding.UTF8.GetString(buf, 0, strlen);
+
+                        OpenUrlRequested?.Invoke(this, new RequestAddUrlEventArgs(url));
+                    }
+                    stream.Close();
+                }
+            }
+        }
+
+        private static (NamedPipeClientStream, bool) TryConnect()
+        {
+            NamedPipeClientStream pipe = new NamedPipeClientStream(PIPE_PATH);
+            bool exist;
+            try
+            {
+                pipe.Connect(10);
+                exist = true;
+            }
+            catch (TimeoutException)
+            {
+                exist = false;
+            }
+            return (pipe, exist);
+        }
+
+        public static bool AnotherInstanceRunning()
+        {
+            (NamedPipeClientStream pipe, bool exist) = TryConnect();
+            pipe.Dispose();
+            return exist;
+        }
+
+        public static void RequestOpenUrl(string url)
+        {
+            (NamedPipeClientStream pipe, bool exist) = TryConnect();
+            if(!exist) return;
+            byte[] opAddUrl = BitConverter.GetBytes(IPAddress.HostToNetworkOrder(OP_OPEN_URL));
+            pipe.Write(opAddUrl, 0, INT32_LEN); // opcode addurl
+            byte[] b = Encoding.UTF8.GetBytes(url);
+            byte[] blen = BitConverter.GetBytes(IPAddress.HostToNetworkOrder(b.Length));
+            pipe.Write(blen, 0, INT32_LEN);
+            pipe.Write(b, 0, b.Length);
+            pipe.Close();
+            pipe.Dispose();
+        }
+    }
+}
diff --git a/shadowsocks-csharp/Controller/Service/NamedPipeServer.cs b/shadowsocks-csharp/Controller/Service/NamedPipeServer.cs
deleted file mode 100644
index 23689231..00000000
--- a/shadowsocks-csharp/Controller/Service/NamedPipeServer.cs
+++ /dev/null
@@ -1,47 +0,0 @@
-using System;
-using System.IO;
-using System.IO.Pipes;
-using System.Net;
-using System.Text;
-
-namespace Shadowsocks.Controller
-{
-    class RequestAddUrlEventArgs : EventArgs
-    {
-        public readonly string Url;
-
-        public RequestAddUrlEventArgs(string url)
-        {
-            this.Url = url;
-        }
-    }
-
-    internal class NamedPipeServer
-    {
-        public event EventHandler<RequestAddUrlEventArgs> AddUrlRequested;
-        public async void Run(string path)
-        {
-            byte[] buf = new byte[4096];
-            while (true)
-            {
-                using (NamedPipeServerStream stream = new NamedPipeServerStream(path))
-                {
-                    stream.WaitForConnection();
-                    await stream.ReadAsync(buf, 0, 4);
-                    int opcode = IPAddress.NetworkToHostOrder(BitConverter.ToInt32(buf, 0));
-                    if (opcode == 1)
-                    {
-                        await stream.ReadAsync(buf, 0, 4);
-                        int strlen = IPAddress.NetworkToHostOrder(BitConverter.ToInt32(buf, 0));
-
-                        await stream.ReadAsync(buf, 0, strlen);
-                        string url = Encoding.UTF8.GetString(buf, 0, strlen);
-
-                        AddUrlRequested?.Invoke(this, new RequestAddUrlEventArgs(url));
-                    }
-                    stream.Close();
-                }
-            }
-        }
-    }
-}
diff --git a/shadowsocks-csharp/Program.cs b/shadowsocks-csharp/Program.cs
index 2bee9850..c05bb9cc 100755
--- a/shadowsocks-csharp/Program.cs
+++ b/shadowsocks-csharp/Program.cs
@@ -67,48 +67,21 @@ namespace Shadowsocks
                 }
                 return;
             }
-            string pipename = $"Shadowsocks\\{ExecutablePath.GetHashCode()}";
 
-            using (NamedPipeClientStream pipe = new NamedPipeClientStream(pipename))
+            if (IPCService.AnotherInstanceRunning())
             {
-                bool pipeExist = false;
-                try
+                if (!string.IsNullOrWhiteSpace(Options.OpenUrl))
                 {
-                    pipe.Connect(10);
-                    pipeExist = true;
+                    IPCService.RequestOpenUrl(Options.OpenUrl);
                 }
-                catch (TimeoutException)
+                else
                 {
-                    pipeExist = false;
-                }
-
-                // --open-url exist, and no other instance, add it later
-                if (pipeExist && !string.IsNullOrWhiteSpace(Options.OpenUrl))
-                {
-                    byte[] b = Encoding.UTF8.GetBytes(Options.OpenUrl);
-                    byte[] opAddUrl = BitConverter.GetBytes(IPAddress.HostToNetworkOrder(1));
-                    byte[] blen = BitConverter.GetBytes(IPAddress.HostToNetworkOrder(b.Length));
-                    pipe.Write(opAddUrl, 0, 4); // opcode addurl
-                    pipe.Write(blen, 0, 4);
-                    pipe.Write(b, 0, b.Length);
-                    pipe.Close();
-                    return;
-                }
-
-                // has another instance, and no need to communicate with it return
-                else if (pipeExist)
-                {
-                    Process[] oldProcesses = Process.GetProcessesByName("Shadowsocks");
-                    if (oldProcesses.Length > 0)
-                    {
-                        Process oldProcess = oldProcesses[0];
-                    }
                     MessageBox.Show(I18N.GetString("Find Shadowsocks icon in your notify tray.")
-                        + Environment.NewLine
-                        + I18N.GetString("If you want to start multiple Shadowsocks, make a copy in another directory."),
+                                    + Environment.NewLine
+                                    + I18N.GetString("If you want to start multiple Shadowsocks, make a copy in another directory."),
                         I18N.GetString("Shadowsocks is already running."));
-                    return;
                 }
+                return;
             }
 
             Utils.ReleaseMemory(true);
@@ -136,9 +109,10 @@ namespace Shadowsocks
             HotKeys.Init(MainController);
             MainController.Start();
 
-            NamedPipeServer namedPipeServer = new NamedPipeServer();
-            Task.Run(() => namedPipeServer.Run(pipename));
-            namedPipeServer.AddUrlRequested += (_1, e) => MainController.AskAddServerBySSURL(e.Url);
+            IPCService ipcService = new IPCService();
+            Task.Run(() => ipcService.RunServer());
+            ipcService.OpenUrlRequested += (_1, e) => MainController.AskAddServerBySSURL(e.Url);
+
             if (!string.IsNullOrWhiteSpace(Options.OpenUrl))
             {
                 MainController.AskAddServerBySSURL(Options.OpenUrl);
diff --git a/shadowsocks-csharp/shadowsocks-csharp.csproj b/shadowsocks-csharp/shadowsocks-csharp.csproj
index c9f298df..a5229a78 100644
--- a/shadowsocks-csharp/shadowsocks-csharp.csproj
+++ b/shadowsocks-csharp/shadowsocks-csharp.csproj
@@ -170,7 +170,7 @@
     <Compile Include="Controller\LoggerExtension.cs" />
     <Compile Include="Controller\Service\GeositeUpdater.cs" />
     <Compile Include="Controller\Service\PACDaemon.cs" />
-    <Compile Include="Controller\Service\NamedPipeServer.cs" />
+    <Compile Include="Controller\Service\IPCService.cs" />
     <Compile Include="Controller\System\ProtocolHandler.cs" />
     <Compile Include="Controller\System\Hotkeys\HotkeyCallbacks.cs" />
     <Compile Include="Encryption\AEAD\AEADEncryptor.cs" />