diff --git a/shadowsocks-csharp/Controller/Service/PACServer.cs b/shadowsocks-csharp/Controller/Service/PACServer.cs
index 5db8b64a..c6853331 100644
--- a/shadowsocks-csharp/Controller/Service/PACServer.cs
+++ b/shadowsocks-csharp/Controller/Service/PACServer.cs
@@ -147,7 +147,7 @@ Connection: Close
 ", Encoding.UTF8.GetBytes(pac).Length) + pac;
                 byte[] response = Encoding.UTF8.GetBytes(text);
                 socket.BeginSend(response, 0, response.Length, 0, new AsyncCallback(SendCallback), socket);
-                Util.Utils.ReleaseMemory(true);
+                Utils.ReleaseMemory(true);
             }
             catch (Exception e)
             {
diff --git a/shadowsocks-csharp/Controller/ShadowsocksController.cs b/shadowsocks-csharp/Controller/ShadowsocksController.cs
index 9ddce8ca..356f58cb 100755
--- a/shadowsocks-csharp/Controller/ShadowsocksController.cs
+++ b/shadowsocks-csharp/Controller/ShadowsocksController.cs
@@ -63,8 +63,8 @@ namespace Shadowsocks.Controller
         public ShadowsocksController()
         {
             _config = Configuration.Load();
-            inboundCounter = _config.bandwidthIn;
-            outboundCounter = _config.bandwidthOut;
+            inboundCounter = _config.GetCurrentServer().bandwidthIn;
+            outboundCounter = _config.GetCurrentServer().bandwidthOut;
             StatisticsConfiguration = StatisticsStrategyConfiguration.Load();
             _strategyManager = new StrategyManager(this);
             StartReleasingMemory();
@@ -312,21 +312,21 @@ namespace Shadowsocks.Controller
         public void UpdateInboundCounter(long n)
         {
             Interlocked.Add(ref inboundCounter, n);
-            _config.bandwidthIn = inboundCounter;
+            _config.GetCurrentServer().bandwidthIn = inboundCounter;
         }
 
         public void UpdateOutboundCounter(long n)
         {
             Interlocked.Add(ref outboundCounter, n);
-            _config.bandwidthOut = outboundCounter;
+            _config.GetCurrentServer().bandwidthOut = outboundCounter;
         }
 
         protected void Reload()
         {
             // some logic in configuration updated the config when saving, we need to read it again
             _config = Configuration.Load();
-            inboundCounter = _config.bandwidthIn;
-            outboundCounter = _config.bandwidthOut;
+            inboundCounter = _config.GetCurrentServer().bandwidthIn;
+            outboundCounter = _config.GetCurrentServer().bandwidthOut;
             StatisticsConfiguration = StatisticsStrategyConfiguration.Load();
 
             if (polipoRunner == null)
@@ -404,7 +404,7 @@ namespace Shadowsocks.Controller
             }
 
             UpdateSystemProxy();
-            Util.Utils.ReleaseMemory(true);
+            Utils.ReleaseMemory(true);
         }
 
         protected void SaveConfig(Configuration newConfig)
@@ -500,7 +500,7 @@ namespace Shadowsocks.Controller
         {
             while (true)
             {
-                Util.Utils.ReleaseMemory(false);
+                Utils.ReleaseMemory(false);
                 Thread.Sleep(30 * 1000);
             }
         }
diff --git a/shadowsocks-csharp/Model/Configuration.cs b/shadowsocks-csharp/Model/Configuration.cs
index b97cad03..d65c23a9 100755
--- a/shadowsocks-csharp/Model/Configuration.cs
+++ b/shadowsocks-csharp/Model/Configuration.cs
@@ -25,8 +25,6 @@ namespace Shadowsocks.Model
         public bool availabilityStatistics;
         public bool autoCheckUpdate;
         public LogViewerConfig logViewer;
-        public long bandwidthIn;
-        public long bandwidthOut;
 
         private static string CONFIG_FILE = "gui-config.json";
 
diff --git a/shadowsocks-csharp/Model/Server.cs b/shadowsocks-csharp/Model/Server.cs
index 8306d9e3..4ae22fde 100755
--- a/shadowsocks-csharp/Model/Server.cs
+++ b/shadowsocks-csharp/Model/Server.cs
@@ -15,6 +15,8 @@ namespace Shadowsocks.Model
         public string method;
         public string remarks;
         public bool auth;
+        public long bandwidthIn;
+        public long bandwidthOut;
 
         public override int GetHashCode()
         {
diff --git a/shadowsocks-csharp/View/MenuViewController.cs b/shadowsocks-csharp/View/MenuViewController.cs
index 435f55ca..32eb992d 100755
--- a/shadowsocks-csharp/View/MenuViewController.cs
+++ b/shadowsocks-csharp/View/MenuViewController.cs
@@ -11,6 +11,7 @@ using ZXing.QrCode;
 using Shadowsocks.Controller;
 using Shadowsocks.Model;
 using Shadowsocks.Properties;
+using Shadowsocks.Util;
 
 namespace Shadowsocks.View
 {
@@ -387,7 +388,7 @@ namespace Shadowsocks.View
         void configForm_FormClosed(object sender, FormClosedEventArgs e)
         {
             configForm = null;
-            Util.Utils.ReleaseMemory(true);
+            Utils.ReleaseMemory(true);
             ShowFirstTimeBalloon();
         }