diff --git a/v2rayN/v2rayN.sln b/v2rayN/v2rayN.sln
index 64cf71f4..f4dc9d50 100644
--- a/v2rayN/v2rayN.sln
+++ b/v2rayN/v2rayN.sln
@@ -1,7 +1,7 @@
 
 Microsoft Visual Studio Solution File, Format Version 12.00
-# Visual Studio 15
-VisualStudioVersion = 15.0.28010.2050
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.29926.136
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "v2rayN", "v2rayN\v2rayN.csproj", "{0A9785E6-D256-4B73-9757-4EF59955FD1E}"
 EndProject
@@ -35,7 +35,8 @@ Global
 		HideSolutionNode = FALSE
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
-		RESX_SortFileContentOnSave = True
+		RESX_ResXSortingComparison = CurrentCulture
 		SolutionGuid = {56B88873-C9CC-4069-A1E5-DABD6C6E865E}
+		RESX_SortFileContentOnSave = True
 	EndGlobalSection
 EndGlobal
diff --git a/v2rayN/v2rayN/Forms/MainForm.Designer.cs b/v2rayN/v2rayN/Forms/MainForm.Designer.cs
index b8d03aca..6aabf5cc 100644
--- a/v2rayN/v2rayN/Forms/MainForm.Designer.cs
+++ b/v2rayN/v2rayN/Forms/MainForm.Designer.cs
@@ -167,7 +167,6 @@
             this.lvServers.UseCompatibleStateImageBehavior = false;
             this.lvServers.View = System.Windows.Forms.View.Details;
             this.lvServers.SelectedIndexChanged += new System.EventHandler(this.lvServers_SelectedIndexChanged);
-            this.lvServers.Click += new System.EventHandler(this.lvServers_Click);
             this.lvServers.DoubleClick += new System.EventHandler(this.lvServers_DoubleClick);
             this.lvServers.KeyDown += new System.Windows.Forms.KeyEventHandler(this.lvServers_KeyDown);
             // 
diff --git a/v2rayN/v2rayN/Forms/MainForm.cs b/v2rayN/v2rayN/Forms/MainForm.cs
index 59cb17a2..4a0f04b9 100644
--- a/v2rayN/v2rayN/Forms/MainForm.cs
+++ b/v2rayN/v2rayN/Forms/MainForm.cs
@@ -312,24 +312,18 @@ namespace v2rayN.Forms
 
         private void lvServers_SelectedIndexChanged(object sender, EventArgs e)
         {
-            int index = -1;
-            try
-            {
-                if (lvServers.SelectedIndices.Count > 0)
-                {
-                    index = lvServers.SelectedIndices[0];
-                }
-            }
-            catch
-            {
-            }
-            if (index < 0)
-            {
-                return;
-            }
-            //qrCodeControl.showQRCode(index, config);
+            RefreshQRCodePanel();
         }
 
+        private void RefreshQRCodePanel()
+        {
+            if (scMain.Panel2Collapsed) return; // saving cpu.
+            if (lvServers.SelectedIndices.Count > 0)
+            {
+                int index = lvServers.SelectedIndices[0];
+                qrCodeControl.showQRCode(index, config);
+            }
+        }
         private void RefreshTaryIcon()
         {
             notifyMain.Icon = MainFormHandler.Instance.GetNotifyIcon(config, this.Icon);
@@ -464,26 +458,6 @@ namespace v2rayN.Forms
 
         #region 功能按钮
 
-        private void lvServers_Click(object sender, EventArgs e)
-        {
-            int index = -1;
-            try
-            {
-                if (lvServers.SelectedIndices.Count > 0)
-                {
-                    index = lvServers.SelectedIndices[0];
-                }
-            }
-            catch
-            {
-            }
-            if (index < 0)
-            {
-                return;
-            }
-            qrCodeControl.showQRCode(index, config);
-        }
-
         private void lvServers_DoubleClick(object sender, EventArgs e)
         {
             int index = GetLvSelectedIndex();
@@ -1601,6 +1575,7 @@ namespace v2rayN.Forms
         {
             bool bShow = tsbQRCodeSwitch.Checked;
             scMain.Panel2Collapsed = !bShow;
+            RefreshQRCodePanel();
         }
         #endregion
 
@@ -1629,8 +1604,6 @@ namespace v2rayN.Forms
             RefreshTaryIcon();
         }
 
-
-
         private async void toolSslServerLatencyRefresh()
         {
             toolSslServerLatencySet(UIRes.I18N("ServerLatencyChecking"));
diff --git a/v2rayN/v2rayN/Properties/Resources.resx b/v2rayN/v2rayN/Properties/Resources.resx
index ebe3751a..7cd3b257 100644
--- a/v2rayN/v2rayN/Properties/Resources.resx
+++ b/v2rayN/v2rayN/Properties/Resources.resx
@@ -163,10 +163,10 @@
   <data name="sub" type="System.Resources.ResXFileRef, System.Windows.Forms">
     <value>..\resources\sub.png;System.Drawing.Bitmap, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a</value>
   </data>
-  <data name="sysproxy64_exe" type="System.Resources.ResXFileRef, System.Windows.Forms">
-    <value>..\resources\sysproxy64.exe.gz;System.Byte[], mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
-  </data>
   <data name="sysproxy_exe" type="System.Resources.ResXFileRef, System.Windows.Forms">
     <value>..\resources\sysproxy.exe.gz;System.Byte[], mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
   </data>
+  <data name="sysproxy64_exe" type="System.Resources.ResXFileRef, System.Windows.Forms">
+    <value>..\resources\sysproxy64.exe.gz;System.Byte[], mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </data>
 </root>
\ No newline at end of file