diff --git a/shadowsocks-csharp/Encryption/MbedTLS.cs b/shadowsocks-csharp/Encryption/MbedTLS.cs
index 8ad9cd09..a7162f66 100644
--- a/shadowsocks-csharp/Encryption/MbedTLS.cs
+++ b/shadowsocks-csharp/Encryption/MbedTLS.cs
@@ -19,7 +19,7 @@ namespace Shadowsocks.Encryption
             {
                 FileManager.UncompressFile(dllPath, Resources.libsscrypto_dll);
             }
-            catch (IOException ex)
+            catch (IOException)
             {
             }
             catch (Exception e)
diff --git a/shadowsocks-csharp/Model/StatisticsStrategyConfiguration.cs b/shadowsocks-csharp/Model/StatisticsStrategyConfiguration.cs
index 62a48c2e..70433117 100644
--- a/shadowsocks-csharp/Model/StatisticsStrategyConfiguration.cs
+++ b/shadowsocks-csharp/Model/StatisticsStrategyConfiguration.cs
@@ -3,17 +3,17 @@ using System.Collections.Generic;
 using System.IO;
 using System.Linq;
 using System.Reflection;
-using Shadowsocks.Controller;
-using Shadowsocks.Controller.Strategy;
-using SimpleJson;
+
 using Newtonsoft.Json;
 
+using Shadowsocks.Controller;
+
 namespace Shadowsocks.Model
 {
     [Serializable]
     public class StatisticsStrategyConfiguration
     {
-        public static readonly string ID = "com.shadowsocks.strategy.statistics"; 
+        public static readonly string ID = "com.shadowsocks.strategy.statistics";
         private bool _statisticsEnabled = true;
         private bool _byIsp = false;
         private bool _byHourOfDay = false;
@@ -21,7 +21,6 @@ namespace Shadowsocks.Model
         private int _dataCollectionMinutes = 10;
         private int _repeatTimesNum = 4;
 
-
         private const string ConfigFile = "statistics-config.json";
 
         public static StatisticsStrategyConfiguration Load()
@@ -32,7 +31,7 @@ namespace Shadowsocks.Model
                 var configuration = JsonConvert.DeserializeObject<StatisticsStrategyConfiguration>(content);
                 return configuration;
             }
-            catch (FileNotFoundException e)
+            catch (FileNotFoundException)
             {
                 var configuration = new StatisticsStrategyConfiguration();
                 Save(configuration);
@@ -62,10 +61,10 @@ namespace Shadowsocks.Model
 
         public StatisticsStrategyConfiguration()
         {
-            var availabilityStatisticsType = typeof (AvailabilityStatistics);
+            var availabilityStatisticsType = typeof(AvailabilityStatistics);
             var statisticsData = availabilityStatisticsType.GetNestedType("StatisticsData");
             var properties = statisticsData.GetFields(BindingFlags.Instance | BindingFlags.Public);
-            Calculations = properties.ToDictionary(p => p.Name, _ => (float) 0);
+            Calculations = properties.ToDictionary(p => p.Name, _ => (float)0);
         }
 
         public bool StatisticsEnabled