diff --git a/shadowsocks-csharp/3rd/SimpleJson.cs b/shadowsocks-csharp/3rd/SimpleJson.cs
index 2850137d..6581e84b 100644
--- a/shadowsocks-csharp/3rd/SimpleJson.cs
+++ b/shadowsocks-csharp/3rd/SimpleJson.cs
@@ -1035,13 +1035,13 @@ namespace SimpleJson
 
         protected static bool SerializeArray(IJsonSerializerStrategy jsonSerializerStrategy, IEnumerable anArray, StringBuilder builder)
         {
-            builder.Append("[");
+            builder.Append("[\r\n  ");
 
             bool first = true;
             foreach (object value in anArray)
             {
                 if (!first)
-                    builder.Append(",");
+                    builder.Append(",\r\n  ");
 
                 if (!SerializeValue(jsonSerializerStrategy, value, builder))
                     return false;
@@ -1049,7 +1049,7 @@ namespace SimpleJson
                 first = false;
             }
 
-            builder.Append("]");
+            builder.Append("\r\n]");
             return true;
         }
 
diff --git a/shadowsocks-csharp/Controller/GfwListUpdater.cs b/shadowsocks-csharp/Controller/GfwListUpdater.cs
index 2b3db383..fded3a59 100644
--- a/shadowsocks-csharp/Controller/GfwListUpdater.cs
+++ b/shadowsocks-csharp/Controller/GfwListUpdater.cs
@@ -3,88 +3,70 @@ using System.Collections.Generic;
 using System.Text;
 using System.Net;
 using System.IO;
+using Shadowsocks.Properties;
+using System.IO.Compression;
+using System.Text.RegularExpressions;
+using SimpleJson;
+using Shadowsocks.Util;
 
 namespace Shadowsocks.Controller
 {
-    public class GfwListUpdater
+    public class GFWListUpdater
     {
         private const string GFWLIST_URL = "https://autoproxy-gfwlist.googlecode.com/svn/trunk/gfwlist.txt";
 
-        public IWebProxy proxy = null;
+        private static string PAC_FILE = PACServer.PAC_FILE;
 
-        public class GfwListDownloadCompletedArgs : EventArgs
-        {
-            public string Content;
-        }
-
-        public event EventHandler<GfwListDownloadCompletedArgs> DownloadCompleted;
+        public event EventHandler UpdateCompleted;
 
         public event ErrorEventHandler Error;
 
-        public void Download()
-        {
-            WebClient http = new WebClient();
-            http.Proxy = proxy;
-            http.DownloadStringCompleted += http_DownloadStringCompleted;
-            http.DownloadStringAsync(new Uri(GFWLIST_URL));
-        }
-
-        protected void ReportError(Exception e)
-        {
-            if (Error != null)
-            {
-                Error(this, new ErrorEventArgs(e));
-            }
-        }
-
         private void http_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
         {
             try
             {
-                string response = e.Result;
-                if (DownloadCompleted != null)
+                string[] lines = ParseResult(e.Result);
+
+                JsonArray rules = new JsonArray();
+                rules.AddRange(lines);
+                string abpContent = Utils.UnGzip(Resources.abp_js);
+                abpContent = abpContent.Replace("__RULES__", rules.ToString());
+                File.WriteAllText(PAC_FILE, abpContent, Encoding.UTF8);
+                if (UpdateCompleted != null)
                 {
-                    DownloadCompleted(this, new GfwListDownloadCompletedArgs
-                    {
-                        Content = response
-                    });
+                    UpdateCompleted(this, new EventArgs());
                 }
             }
             catch (Exception ex)
             {
-                ReportError(ex);
+                if (Error != null)
+                {
+                    Error(this, new ErrorEventArgs(ex));
+                }
             }
         }
 
-        public class Parser
-        {
-            private string _Content;
-
-            public string Content
-            {
-                get { return _Content; }
-            }
 
-            public Parser(string response)
-            {
-                byte[] bytes = Convert.FromBase64String(response);
-                this._Content = Encoding.ASCII.GetString(bytes);
-            }
+        public void UpdatePACFromGFWList()
+        {
+            WebClient http = new WebClient();
+            http.DownloadStringCompleted += http_DownloadStringCompleted;
+            http.DownloadStringAsync(new Uri(GFWLIST_URL));
+        }
 
-            public string[] GetValidLines()
+        public string[] ParseResult(string response)
+        {
+            byte[] bytes = Convert.FromBase64String(response);
+            string content = Encoding.ASCII.GetString(bytes);
+            string[] lines = content.Split(new char[] { '\r', '\n' }, StringSplitOptions.RemoveEmptyEntries);
+            List<string> valid_lines = new List<string>(lines.Length);
+            foreach (string line in lines)
             {
-                string[] lines = Content.Split(new char[] { '\r', '\n' }, StringSplitOptions.RemoveEmptyEntries);
-                List<string> valid_lines = new List<string>(lines.Length);
-                foreach (string line in lines)
-                {
-                    if (line.StartsWith("!") || line.StartsWith("["))
-                        continue;
-                    valid_lines.Add(line);
-                }
-                return valid_lines.ToArray();
+                if (line.StartsWith("!") || line.StartsWith("["))
+                    continue;
+                valid_lines.Add(line);
             }
-
+            return valid_lines.ToArray();
         }
-
     }
 }
diff --git a/shadowsocks-csharp/Controller/PACServer.cs b/shadowsocks-csharp/Controller/PACServer.cs
index fbd1989b..b2456e18 100755
--- a/shadowsocks-csharp/Controller/PACServer.cs
+++ b/shadowsocks-csharp/Controller/PACServer.cs
@@ -1,5 +1,6 @@
 using Shadowsocks.Model;
 using Shadowsocks.Properties;
+using Shadowsocks.Util;
 using System;
 using System.Collections.Generic;
 using System.Diagnostics;
@@ -8,14 +9,13 @@ using System.IO.Compression;
 using System.Net;
 using System.Net.Sockets;
 using System.Text;
-using System.Text.RegularExpressions;
 
 namespace Shadowsocks.Controller
 {
     class PACServer
     {
         private static int PORT = 8093;
-        private static string PAC_FILE = "pac.txt";
+        public static string PAC_FILE = "pac.txt";
         private static Configuration config;
 
         Socket _listener;
@@ -23,10 +23,6 @@ namespace Shadowsocks.Controller
 
         public event EventHandler PACFileChanged;
 
-        public event EventHandler UpdatePACFromGFWListCompleted;
-
-        public event ErrorEventHandler UpdatePACFromGFWListError;
-
         public void Start(Configuration configuration)
         {
             try
@@ -135,19 +131,7 @@ namespace Shadowsocks.Controller
             }
             else
             {
-                byte[] pacGZ = Resources.proxy_pac_txt;
-                byte[] buffer = new byte[1024];  // builtin pac gzip size: maximum 100K
-                MemoryStream sb = new MemoryStream();
-                int n;
-                using (GZipStream input = new GZipStream(new MemoryStream(pacGZ),
-                    CompressionMode.Decompress, false))
-                {
-                    while ((n = input.Read(buffer, 0, buffer.Length)) > 0)
-                    {
-                        sb.Write(buffer, 0, n);
-                    }
-                    return System.Text.Encoding.UTF8.GetString(sb.ToArray());
-                }
+                return Utils.UnGzip(Resources.proxy_pac_txt);
             }
         }
 
@@ -180,7 +164,7 @@ Connection: Close
 ", System.Text.Encoding.UTF8.GetBytes(pac).Length) + pac;
                     byte[] response = System.Text.Encoding.UTF8.GetBytes(text);
                     conn.BeginSend(response, 0, response.Length, 0, new AsyncCallback(SendCallback), conn);
-                    Util.Util.ReleaseMemory();
+                    Util.Utils.ReleaseMemory();
                 }
                 else
                 {
@@ -247,117 +231,5 @@ Connection: Close
             //}
             return proxy;
         }
-
-        public void UpdatePACFromGFWList()
-        {
-            GfwListUpdater gfwlist = new GfwListUpdater();
-            gfwlist.DownloadCompleted += gfwlist_DownloadCompleted;
-            gfwlist.Error += gfwlist_Error;
-            gfwlist.proxy = new WebProxy(IPAddress.Loopback.ToString(), 8123); /* use polipo proxy*/
-            gfwlist.Download();
-        }
-
-        private void gfwlist_DownloadCompleted(object sender, GfwListUpdater.GfwListDownloadCompletedArgs e)
-        {
-            GfwListUpdater.Parser parser = new GfwListUpdater.Parser(e.Content);
-            string[] lines = parser.GetValidLines();
-            StringBuilder rules = new StringBuilder(lines.Length * 16);
-            SerializeRules(lines, rules);
-            string abpContent = GetAbpContent();
-            abpContent = abpContent.Replace("__RULES__", rules.ToString());
-            File.WriteAllText(PAC_FILE, abpContent, Encoding.UTF8);
-            if (UpdatePACFromGFWListCompleted != null)
-            {
-                UpdatePACFromGFWListCompleted(this, new EventArgs());
-            }
-        }
-
-        private void gfwlist_Error(object sender, ErrorEventArgs e)
-        {
-            if (UpdatePACFromGFWListError != null)
-            {
-                UpdatePACFromGFWListError(this, e);
-            }
-        }
-
-        private string GetAbpContent()
-        {
-            string content;
-            if (File.Exists(PAC_FILE))
-            {
-                content = File.ReadAllText(PAC_FILE, Encoding.UTF8);
-                Regex regex = new Regex("var\\s+rules\\s*=\\s*(\\[(\\s*\"[^\"]*\"\\s*,)*(\\s*\"[^\"]*\")\\s*\\])", RegexOptions.Singleline);
-                Match m = regex.Match(content);
-                if (m.Success)
-                {
-                    content = regex.Replace(content, "var rules = __RULES__");
-                    return content;
-                }
-            }
-            byte[] abpGZ = Resources.abp_js;
-            byte[] buffer = new byte[1024];  // builtin pac gzip size: maximum 100K
-            int n;
-            using (MemoryStream sb = new MemoryStream())
-            {
-                using (GZipStream input = new GZipStream(new MemoryStream(abpGZ),
-                    CompressionMode.Decompress, false))
-                {
-                    while ((n = input.Read(buffer, 0, buffer.Length)) > 0)
-                    {
-                        sb.Write(buffer, 0, n);
-                    }
-                }
-                content = System.Text.Encoding.UTF8.GetString(sb.ToArray());
-            }
-            return content;
-        }
-
-        private static void SerializeRules(string[] rules, StringBuilder builder)
-        {
-            builder.Append("[\n");
-
-            bool first = true;
-            foreach (string rule in rules)
-            {
-                if (!first)
-                    builder.Append(",\n");
-
-                SerializeString(rule, builder);
-
-                first = false;
-            }
-
-            builder.Append("\n]");
-        }
-
-        private static void SerializeString(string aString, StringBuilder builder)
-        {
-            builder.Append("\t\"");
-
-            char[] charArray = aString.ToCharArray();
-            for (int i = 0; i < charArray.Length; i++)
-            {
-                char c = charArray[i];
-                if (c == '"')
-                    builder.Append("\\\"");
-                else if (c == '\\')
-                    builder.Append("\\\\");
-                else if (c == '\b')
-                    builder.Append("\\b");
-                else if (c == '\f')
-                    builder.Append("\\f");
-                else if (c == '\n')
-                    builder.Append("\\n");
-                else if (c == '\r')
-                    builder.Append("\\r");
-                else if (c == '\t')
-                    builder.Append("\\t");
-                else
-                    builder.Append(c);
-            }
-
-            builder.Append("\"");
-        }
-
     }
 }
diff --git a/shadowsocks-csharp/Controller/ShadowsocksController.cs b/shadowsocks-csharp/Controller/ShadowsocksController.cs
index 2610bbab..1e193158 100755
--- a/shadowsocks-csharp/Controller/ShadowsocksController.cs
+++ b/shadowsocks-csharp/Controller/ShadowsocksController.cs
@@ -21,6 +21,7 @@ namespace Shadowsocks.Controller
         private PACServer pacServer;
         private Configuration _config;
         private PolipoRunner polipoRunner;
+        private GFWListUpdater gfwListUpdater;
         private bool stopped = false;
 
         private bool _systemProxyIsDirty = false;
@@ -157,13 +158,9 @@ namespace Shadowsocks.Controller
 
         public void UpdatePACFromGFWList()
         {
-            if (pacServer != null)
+            if (gfwListUpdater != null)
             {
-                pacServer.UpdatePACFromGFWList();
-            }
-            else if (UpdatePACFromGFWListError != null)
-            {
-                UpdatePACFromGFWListError(this, new ErrorEventArgs(new Exception("The PACServer is not run.")));
+                gfwListUpdater.UpdatePACFromGFWList();
             }
         }
 
@@ -180,8 +177,12 @@ namespace Shadowsocks.Controller
             {
                 pacServer = new PACServer();
                 pacServer.PACFileChanged += pacServer_PACFileChanged;
-                pacServer.UpdatePACFromGFWListCompleted += pacServer_UpdatePACFromGFWListCompleted;
-                pacServer.UpdatePACFromGFWListError += pacServer_UpdatePACFromGFWListError;
+            }
+            if (gfwListUpdater == null)
+            {
+                gfwListUpdater = new GFWListUpdater();
+                gfwListUpdater.UpdateCompleted += pacServer_PACUpdateCompleted;
+                gfwListUpdater.Error += pacServer_PACUpdateError;
             }
 
             pacServer.Stop();
@@ -226,7 +227,7 @@ namespace Shadowsocks.Controller
             }
 
             UpdateSystemProxy();
-            Util.Util.ReleaseMemory();
+            Util.Utils.ReleaseMemory();
         }
 
 
@@ -260,13 +261,13 @@ namespace Shadowsocks.Controller
             UpdateSystemProxy();
         }
 
-        private void pacServer_UpdatePACFromGFWListCompleted(object sender, EventArgs e)
+        private void pacServer_PACUpdateCompleted(object sender, EventArgs e)
         {
             if (UpdatePACFromGFWListCompleted != null)
                 UpdatePACFromGFWListCompleted(this, e);
         }
 
-        private void pacServer_UpdatePACFromGFWListError(object sender, ErrorEventArgs e)
+        private void pacServer_PACUpdateError(object sender, ErrorEventArgs e)
         {
             if (UpdatePACFromGFWListError != null)
                 UpdatePACFromGFWListError(this, e);
@@ -283,7 +284,7 @@ namespace Shadowsocks.Controller
         {
             while (true)
             {
-                Util.Util.ReleaseMemory();
+                Util.Utils.ReleaseMemory();
                 Thread.Sleep(30 * 1000);
             }
         }
diff --git a/shadowsocks-csharp/Data/abp.js.gz b/shadowsocks-csharp/Data/abp.js.gz
old mode 100644
new mode 100755
index d265cfd6..e049c0a4
Binary files a/shadowsocks-csharp/Data/abp.js.gz and b/shadowsocks-csharp/Data/abp.js.gz differ
diff --git a/shadowsocks-csharp/Data/cn.txt b/shadowsocks-csharp/Data/cn.txt
index f67af0d2..9f8c6da1 100644
--- a/shadowsocks-csharp/Data/cn.txt
+++ b/shadowsocks-csharp/Data/cn.txt
@@ -39,6 +39,6 @@ Shadowsocks is here=Shadowsocks 在这里
 You can turn on/off Shadowsocks in the context menu=可以在右键菜单中开关 Shadowsocks
 Enabled=已启用代理
 Disabled=已禁用代理
-Update PAC File via GFWList...=从 GFWList 更新 PAC 文件...
+Update PAC from GFWList=从 GFWList 更新 PAC
 Failed to update PAC file =更新 PAC 文件失败
 PAC updated=更新 PAC 成功
diff --git a/shadowsocks-csharp/Program.cs b/shadowsocks-csharp/Program.cs
index 716e0df7..8ca485d7 100755
--- a/shadowsocks-csharp/Program.cs
+++ b/shadowsocks-csharp/Program.cs
@@ -18,7 +18,7 @@ namespace Shadowsocks
         [STAThread]
         static void Main()
         {
-            Util.Util.ReleaseMemory();
+            Util.Utils.ReleaseMemory();
             using (Mutex mutex = new Mutex(false, "Global\\" + "71981632-A427-497F-AB91-241CD227EC1F"))
             {
                 Application.EnableVisualStyles();
diff --git a/shadowsocks-csharp/Util/Util.cs b/shadowsocks-csharp/Util/Util.cs
index afb5539a..15463a3a 100755
--- a/shadowsocks-csharp/Util/Util.cs
+++ b/shadowsocks-csharp/Util/Util.cs
@@ -1,12 +1,14 @@
 using System;
 using System.Collections.Generic;
 using System.Diagnostics;
+using System.IO;
+using System.IO.Compression;
 using System.Runtime.InteropServices;
 using System.Text;
 
 namespace Shadowsocks.Util
 {
-    public class Util
+    public class Utils
     {
         public static void ReleaseMemory()
         {
@@ -22,6 +24,24 @@ namespace Shadowsocks.Util
                 (UIntPtr)0xFFFFFFFF, (UIntPtr)0xFFFFFFFF);
         }
 
+        public static string UnGzip(byte[] buf)
+        {
+            byte[] buffer = new byte[1024];
+            int n;
+            using (MemoryStream sb = new MemoryStream())
+            {
+                using (GZipStream input = new GZipStream(new MemoryStream(buf),
+                    CompressionMode.Decompress, false))
+                {
+                    while ((n = input.Read(buffer, 0, buffer.Length)) > 0)
+                    {
+                        sb.Write(buffer, 0, n);
+                    }
+                }
+                return System.Text.Encoding.UTF8.GetString(sb.ToArray());
+            }
+        }
+
         [DllImport("kernel32.dll")]
         [return: MarshalAs(UnmanagedType.Bool)]
         private static extern bool SetProcessWorkingSetSize(IntPtr process,
diff --git a/shadowsocks-csharp/View/MenuViewController.cs b/shadowsocks-csharp/View/MenuViewController.cs
index 1ab517f9..76da6036 100755
--- a/shadowsocks-csharp/View/MenuViewController.cs
+++ b/shadowsocks-csharp/View/MenuViewController.cs
@@ -141,7 +141,7 @@ namespace Shadowsocks.View
                 this.AutoStartupItem = CreateMenuItem("Start on Boot", new EventHandler(this.AutoStartupItem_Click)),
                 this.ShareOverLANItem = CreateMenuItem("Share over LAN", new EventHandler(this.ShareOverLANItem_Click)),
                 CreateMenuItem("Edit PAC File...", new EventHandler(this.EditPACFileItem_Click)),
-                CreateMenuItem("Update PAC File via gfwlist...", new EventHandler(this.UpdatePACFromGFWListItem_Click)),
+                CreateMenuItem("Update PAC from GFWList", new EventHandler(this.UpdatePACFromGFWListItem_Click)),
                 new MenuItem("-"),
                 CreateMenuItem("Show QRCode...", new EventHandler(this.QRCodeItem_Click)),
                 CreateMenuItem("Show Logs...", new EventHandler(this.ShowLogItem_Click)),
@@ -265,7 +265,7 @@ namespace Shadowsocks.View
         void configForm_FormClosed(object sender, FormClosedEventArgs e)
         {
             configForm = null;
-            Util.Util.ReleaseMemory();
+            Util.Utils.ReleaseMemory();
             ShowFirstTimeBalloon();
         }
 
diff --git a/shadowsocks-csharp/shadowsocks-csharp.csproj b/shadowsocks-csharp/shadowsocks-csharp.csproj
index 1848edd9..d14d7287 100755
--- a/shadowsocks-csharp/shadowsocks-csharp.csproj
+++ b/shadowsocks-csharp/shadowsocks-csharp.csproj
@@ -86,7 +86,7 @@
     <Compile Include="3rd\zxing\Version.cs" />
     <Compile Include="Controller\AutoStartup.cs" />
     <Compile Include="Controller\FileManager.cs" />
-    <Compile Include="Controller\GfwListUpdater.cs" />
+    <Compile Include="Controller\GFWListUpdater.cs" />
     <Compile Include="Controller\I18N.cs" />
     <Compile Include="Controller\Logging.cs" />
     <Compile Include="Controller\UpdateChecker.cs" />