diff --git a/Jenkinsfile b/Jenkinsfile
index d2e6d27..17b316e 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -10,7 +10,7 @@ pipeline {
       steps {
       /* calcolo numero versione... diverso x branch MASTER/DEVELOP */
       script {
-        withEnv(['NEXT_BUILD_NUMBER=663']) {
+        withEnv(['NEXT_BUILD_NUMBER=665']) {
           // env.versionNumber = VersionNumber(versionNumberString : '3.2.${BUILD_DATE_FORMATTED, "yyMM"}.${BUILDS_ALL_TIME}', projectStartDate : '2006-01-01', skipFailedBuilds: true)
           env.versionNumber = VersionNumber(versionNumberString : '3.2.${BUILD_DATE_FORMATTED, "yyMM"}.${BUILDS_ALL_TIME}', projectStartDate : '2006-01-01', skipFailedBuilds: true, overrideBuildsAllTime: '${NEXT_BUILD_NUMBER}')
           env.APP_NAME = 'SteamWareLib'
diff --git a/SteamWareLib/ApplicationUserControl.cs b/SteamWareLib/ApplicationUserControl.cs
index 7173600..1b9ef8a 100644
--- a/SteamWareLib/ApplicationUserControl.cs
+++ b/SteamWareLib/ApplicationUserControl.cs
@@ -642,7 +642,7 @@ namespace SteamWare
       _paginaCorrente = finalUrl[n - 1].ToString();
       // tolgo .aspx!
       _paginaCorrente = _paginaCorrente.Replace(".aspx", "");
-      if (_paginaPrecedente == "" || _paginaPrecedente == null)
+      if (string.IsNullOrEmpty(_paginaPrecedente) || _paginaPrecedente == null)
       {
         _paginaPrecedente = _paginaCorrente;
         memLayer.ML.setSessionVal("_paginaPrecedente", _paginaPrecedente);
@@ -756,7 +756,7 @@ namespace SteamWare
         try
         {
           _dataFrom = _dataFrom.Replace(".", "/");
-          if (_dataFrom == "")
+          if (string.IsNullOrEmpty(_dataFrom))
           {
             _dataFrom = "01/01/1900";
           }
@@ -768,7 +768,7 @@ namespace SteamWare
         try
         {
           _dataTo = _dataTo.Replace(".", "/");
-          if (_dataTo == "")
+          if (string.IsNullOrEmpty(_dataTo))
           {
             _dataTo = "01/01/2200";
           }
@@ -811,7 +811,7 @@ namespace SteamWare
         try
         {
           _data = _data.Replace(".", "/");
-          if (_data == "")
+          if (string.IsNullOrEmpty(_data))
           {
             _data = "01/01/1900";
           }
diff --git a/SteamWareLib/SteamWare.csproj b/SteamWareLib/SteamWare.csproj
index dc85f09..aba4449 100644
--- a/SteamWareLib/SteamWare.csproj
+++ b/SteamWareLib/SteamWare.csproj
@@ -68,8 +68,8 @@
     <Reference Include="AegisImplicitMail, Version=1.0.3.0, Culture=neutral, processorArchitecture=MSIL">
       <HintPath>..\packages\AIM.1.0.3\lib\AegisImplicitMail.dll</HintPath>
     </Reference>
-    <Reference Include="AjaxControlToolkit, Version=18.1.1.0, Culture=neutral, PublicKeyToken=28f01b0e84b6d53e, processorArchitecture=MSIL">
-      <HintPath>..\packages\AjaxControlToolkit.18.1.1\lib\net40\AjaxControlToolkit.dll</HintPath>
+    <Reference Include="AjaxControlToolkit, Version=19.1.0.0, Culture=neutral, PublicKeyToken=28f01b0e84b6d53e, processorArchitecture=MSIL">
+      <HintPath>..\packages\AjaxControlToolkit.19.1.0\lib\net40\AjaxControlToolkit.dll</HintPath>
     </Reference>
     <Reference Include="ICSharpCode.SharpZipLib, Version=1.1.0.145, Culture=neutral, PublicKeyToken=1b03e6acf1164f73, processorArchitecture=MSIL">
       <HintPath>..\packages\SharpZipLib.1.1.0\lib\net45\ICSharpCode.SharpZipLib.dll</HintPath>
@@ -79,7 +79,7 @@
       <HintPath>..\packages\Newtonsoft.Json.12.0.2\lib\net45\Newtonsoft.Json.dll</HintPath>
     </Reference>
     <Reference Include="NLog, Version=4.0.0.0, Culture=neutral, PublicKeyToken=5120e14c03d0593c, processorArchitecture=MSIL">
-      <HintPath>..\packages\NLog.4.6.4\lib\net45\NLog.dll</HintPath>
+      <HintPath>..\packages\NLog.4.6.5\lib\net45\NLog.dll</HintPath>
     </Reference>
     <Reference Include="Pipelines.Sockets.Unofficial, Version=1.0.0.0, Culture=neutral, PublicKeyToken=42ea0a778e13fbe2, processorArchitecture=MSIL">
       <HintPath>..\packages\Pipelines.Sockets.Unofficial.2.0.22\lib\net461\Pipelines.Sockets.Unofficial.dll</HintPath>
@@ -124,8 +124,8 @@
     <Reference Include="System.Threading.Channels, Version=4.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51, processorArchitecture=MSIL">
       <HintPath>..\packages\System.Threading.Channels.4.5.0\lib\netstandard2.0\System.Threading.Channels.dll</HintPath>
     </Reference>
-    <Reference Include="System.Threading.Tasks.Extensions, Version=4.2.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51, processorArchitecture=MSIL">
-      <HintPath>..\packages\System.Threading.Tasks.Extensions.4.5.2\lib\netstandard2.0\System.Threading.Tasks.Extensions.dll</HintPath>
+    <Reference Include="System.Threading.Tasks.Extensions, Version=4.2.0.1, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51, processorArchitecture=MSIL">
+      <HintPath>..\packages\System.Threading.Tasks.Extensions.4.5.3\lib\netstandard2.0\System.Threading.Tasks.Extensions.dll</HintPath>
     </Reference>
     <Reference Include="System.Transactions" />
     <Reference Include="System.Web" />
diff --git a/SteamWareLib/app.config b/SteamWareLib/app.config
index 814443b..002c5b9 100644
--- a/SteamWareLib/app.config
+++ b/SteamWareLib/app.config
@@ -78,6 +78,10 @@
         <assemblyIdentity name="System.Memory" publicKeyToken="cc7b13ffcd2ddd51" culture="neutral" />
         <bindingRedirect oldVersion="0.0.0.0-4.0.1.1" newVersion="4.0.1.1" />
       </dependentAssembly>
+      <dependentAssembly>
+        <assemblyIdentity name="System.Threading.Tasks.Extensions" publicKeyToken="cc7b13ffcd2ddd51" culture="neutral" />
+        <bindingRedirect oldVersion="0.0.0.0-4.2.0.1" newVersion="4.2.0.1" />
+      </dependentAssembly>
     </assemblyBinding>
   </runtime>
 </configuration>
diff --git a/SteamWareLib/devicesAuthProxy.cs b/SteamWareLib/devicesAuthProxy.cs
index 3118651..25eb034 100644
--- a/SteamWareLib/devicesAuthProxy.cs
+++ b/SteamWareLib/devicesAuthProxy.cs
@@ -936,7 +936,7 @@ namespace SteamWare
       {
         logger.lg.scriviLog(exc.ToString(), tipoLog.EXCEPTION);
       }
-      if (_lingua == "")
+      if (string.IsNullOrEmpty(_lingua))
       {
         _lingua = "EN";
       }
diff --git a/SteamWareLib/memLayer.cs b/SteamWareLib/memLayer.cs
index 16940a1..19c8672 100644
--- a/SteamWareLib/memLayer.cs
+++ b/SteamWareLib/memLayer.cs
@@ -77,12 +77,12 @@ namespace SteamWare
         string answ = "";
         answ = confReadString("DbConfConnectionString");
         // se fosse vuota fallback a path dei permessi...
-        if (answ == "")
+        if (string.IsNullOrEmpty(answ))
         {
           answ = confReadString("PermessiConnectionString");
         }
         // se ancora vuota --> devAuth
-        if (answ == "")
+        if (string.IsNullOrEmpty(answ))
         {
           answ = confReadString("DevicesAuthConnectionString");
         }
@@ -383,7 +383,7 @@ namespace SteamWare
       string answ = "";
       // PROVO IN PRIMIS a cercare su DB...
       answ = cdv(nomeParam);
-      if (answ == "")
+      if (string.IsNullOrEmpty(answ))
       {
         answ = confReadString(nomeParam);
       }
@@ -1386,7 +1386,7 @@ namespace SteamWare
     private Lazy<ConnectionMultiplexer> lazyConnection = new Lazy<ConnectionMultiplexer>(() =>
     {
       string RedisConn = memLayer.ML.confReadString("RedisConn");
-      if (RedisConn == "")
+      if (string.IsNullOrEmpty(RedisConn))
       {
         RedisConn = "localhost,abortConnect=false,ssl=false";
       }
@@ -1399,7 +1399,7 @@ namespace SteamWare
     private Lazy<ConnectionMultiplexer> lazyConnectionAdmin = new Lazy<ConnectionMultiplexer>(() =>
     {
       string RedisConnAdmin = memLayer.ML.confReadString("RedisConnAdmin");
-      if (RedisConnAdmin == "")
+      if (string.IsNullOrEmpty(RedisConnAdmin))
       {
         RedisConnAdmin = "localhost,abortConnect=false,ssl=false,allowAdmin=true";
       }
@@ -1935,7 +1935,7 @@ namespace SteamWare
       bool answ = false;
       // cerco se ci sia valore in redis...
       // se vuoto = ALL...
-      keyPattern = keyPattern == "" ? "**" : keyPattern;
+      keyPattern = string.IsNullOrEmpty(keyPattern) ? "**" : keyPattern;
       try
       {
         foreach (var ep in connRedis.GetEndPoints())
@@ -1965,7 +1965,7 @@ namespace SteamWare
       int answ = 0;
       // cerco se ci sia valore in redis...
       // se vuoto = ALL...
-      keyPattern = keyPattern == "" ? "**" : keyPattern;
+      keyPattern = string.IsNullOrEmpty(keyPattern) ? "**" : keyPattern;
       try
       {
         foreach (var ep in connRedis.GetEndPoints())
@@ -2017,7 +2017,7 @@ namespace SteamWare
       RedisKey[] chiavi = new RedisKey[numAnsw];
       List<KeyValuePair<string, int>> answ = new List<KeyValuePair<string, int>>();
       // se vuoto = ALL...
-      keyPattern = keyPattern == "" ? "**" : keyPattern;
+      keyPattern = string.IsNullOrEmpty(keyPattern) ? "**" : keyPattern;
 
       // recupero in primis elenco chiavi
       try
diff --git a/SteamWareLib/packages.config b/SteamWareLib/packages.config
index 2d8013a..c19adb5 100644
--- a/SteamWareLib/packages.config
+++ b/SteamWareLib/packages.config
@@ -1,9 +1,9 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
   <package id="AIM" version="1.0.3" targetFramework="net462" />
-  <package id="AjaxControlToolkit" version="18.1.1" targetFramework="net462" />
+  <package id="AjaxControlToolkit" version="19.1.0" targetFramework="net462" />
   <package id="Newtonsoft.Json" version="12.0.2" targetFramework="net462" />
-  <package id="NLog" version="4.6.4" targetFramework="net462" />
+  <package id="NLog" version="4.6.5" targetFramework="net462" />
   <package id="Pipelines.Sockets.Unofficial" version="2.0.22" targetFramework="net462" />
   <package id="SharpZipLib" version="1.1.0" targetFramework="net462" />
   <package id="StackExchange.Redis" version="2.0.601" targetFramework="net462" />
@@ -14,5 +14,5 @@
   <package id="System.Numerics.Vectors" version="4.5.0" targetFramework="net462" />
   <package id="System.Runtime.CompilerServices.Unsafe" version="4.5.2" targetFramework="net462" />
   <package id="System.Threading.Channels" version="4.5.0" targetFramework="net462" />
-  <package id="System.Threading.Tasks.Extensions" version="4.5.2" targetFramework="net462" />
+  <package id="System.Threading.Tasks.Extensions" version="4.5.3" targetFramework="net462" />
 </packages>
\ No newline at end of file
diff --git a/SteamWareLib/user_std.cs b/SteamWareLib/user_std.cs
index 90baea4..7f2eb61 100644
--- a/SteamWareLib/user_std.cs
+++ b/SteamWareLib/user_std.cs
@@ -165,7 +165,7 @@ namespace SteamWare
         _lingua = rigaUtente.COD_LINGUA;
       }
       catch { }
-      if (_lingua == "")
+      if (string.IsNullOrEmpty(_lingua))
       {
         _lingua = "IT";
       }
@@ -421,7 +421,7 @@ namespace SteamWare
         {
           logger.lg.scriviLog(string.Format("Errore recupero lingua utente{0}{1}", Environment.NewLine, exc), tipoLog.EXCEPTION);
         }
-        if (answ == "")
+        if (string.IsNullOrEmpty(answ))
         {
           answ = memLayer.ML.CRS("baseLang");
         }
@@ -610,10 +610,10 @@ namespace SteamWare
       string answ = string.Format("_{0}_", lemma);
       try
       {
-        if (lingua == "")
+        if (string.IsNullOrEmpty(lingua))
         {
           lingua = memLayer.ML.CRS("baseLang");
-          if (lingua == "")
+          if (string.IsNullOrEmpty(lingua))
           {
             lingua = "IT";
           }