diff --git a/Lib_CSharp b/Lib_CSharp
index ce4a59cf..fa260546 160000
--- a/Lib_CSharp
+++ b/Lib_CSharp
@@ -1 +1 @@
-Subproject commit ce4a59cf4a90cf74a3a9116ccbaf6d2e588dc8ad
+Subproject commit fa26054678e1c938b1120f7eaab8b26476700245
diff --git a/PoliNetwork.Graduatorie.Common/Utils/EnrollUtil.cs b/PoliNetwork.Graduatorie.Common/Utils/EnrollUtil.cs
index 0966f075..a9bf26a7 100644
--- a/PoliNetwork.Graduatorie.Common/Utils/EnrollUtil.cs
+++ b/PoliNetwork.Graduatorie.Common/Utils/EnrollUtil.cs
@@ -6,7 +6,7 @@
 
 namespace PoliNetwork.Graduatorie.Common.Utils;
 
-public class EnrollUtil
+public static class EnrollUtil
 {
     public static EnrollType GetEnrollType(string? rowCanEnrollInto, bool rowCanEnroll)
     {
diff --git a/PoliNetwork.Graduatorie.Parser/Objects/Json/DateFound.cs b/PoliNetwork.Graduatorie.Parser/Objects/Json/DateFound.cs
index c3d1aea8..962fa1c1 100644
--- a/PoliNetwork.Graduatorie.Parser/Objects/Json/DateFound.cs
+++ b/PoliNetwork.Graduatorie.Parser/Objects/Json/DateFound.cs
@@ -25,10 +25,14 @@ public void WriteToFile(string dataFolder)
 
     public static DateTime? MinDateTime(DateTime? date1, DateTime? date2)
     {
-        if (date1 == null && date2 == null)
-            return null;
-        if (date1 == null)
-            return date2;
+        switch (date1)
+        {
+            case null when date2 == null:
+                return null;
+            case null:
+                return date2;
+        }
+
         if (date2 == null)
             return date1;
 
diff --git a/PoliNetwork.Graduatorie.Parser/Objects/Json/Indexes/Specific/BySchoolYearCourseJson.cs b/PoliNetwork.Graduatorie.Parser/Objects/Json/Indexes/Specific/BySchoolYearCourseJson.cs
index d13ff51d..0f6a5b53 100644
--- a/PoliNetwork.Graduatorie.Parser/Objects/Json/Indexes/Specific/BySchoolYearCourseJson.cs
+++ b/PoliNetwork.Graduatorie.Parser/Objects/Json/Indexes/Specific/BySchoolYearCourseJson.cs
@@ -268,8 +268,8 @@ private static void AddToRankings(ICollection<Ranking> rankings, Ranking ranking
                 && x.Year == ranking.Year
                 && Similar(x.ByCourse, ranking.ByCourse)
         );
-        
-        if (!any) 
+
+        if (!any)
             rankings.Add(ranking);
     }
 
@@ -281,9 +281,15 @@ private static bool Similar(
         if (a == null || b == null)
             return false;
         return a.Count == b.Count && a.Select(Selector).All(Predicate);
-        
-        bool Selector(CourseTable variable) => b.Any(x => x.Title == variable.Title);
-        bool Predicate(bool boolB) => boolB;
-  
+
+        bool Selector(CourseTable variable)
+        {
+            return b.Any(x => x.Title == variable.Title);
+        }
+
+        bool Predicate(bool boolB)
+        {
+            return boolB;
+        }
     }
 }
\ No newline at end of file
diff --git a/PoliNetwork.Graduatorie.Parser/Objects/Json/SingleCourseJson.cs b/PoliNetwork.Graduatorie.Parser/Objects/Json/SingleCourseJson.cs
index e46d2b86..dc487970 100644
--- a/PoliNetwork.Graduatorie.Parser/Objects/Json/SingleCourseJson.cs
+++ b/PoliNetwork.Graduatorie.Parser/Objects/Json/SingleCourseJson.cs
@@ -18,9 +18,9 @@ public class SingleCourseJson
     public string? Link;
     public string? Location;
     public string? Name;
+    public RankingOrder? RankingOrder;
     public SchoolEnum? School;
     public int? Year;
-    public RankingOrder? RankingOrder;
 
     public int GetHashWithoutLastUpdate()
     {
@@ -59,4 +59,4 @@ public bool Is(CourseTable courseTable)
     {
         return Name == courseTable.Title;
     }
-}
+}
\ No newline at end of file
diff --git a/PoliNetwork.Graduatorie.Parser/Objects/RankingNS/Ranking.cs b/PoliNetwork.Graduatorie.Parser/Objects/RankingNS/Ranking.cs
index d8371585..7778b72f 100644
--- a/PoliNetwork.Graduatorie.Parser/Objects/RankingNS/Ranking.cs
+++ b/PoliNetwork.Graduatorie.Parser/Objects/RankingNS/Ranking.cs
@@ -117,7 +117,7 @@ public List<SingleCourseJson> ToSingleCourseJson()
             Year = Year,
             School = School,
             Location = variable.Location,
-            RankingOrder = RankingOrder,
+            RankingOrder = RankingOrder
         }));
 
         return result;
@@ -137,4 +137,4 @@ public string GetPath()
     {
         return School + "/" + Year + "/" + RankingOrder?.Phase;
     }
-}
+}
\ No newline at end of file
diff --git a/PoliNetwork.Graduatorie.Parser/Utils/Hashing.cs b/PoliNetwork.Graduatorie.Parser/Utils/Hashing.cs
index 5940ac04..e71a7ceb 100644
--- a/PoliNetwork.Graduatorie.Parser/Utils/Hashing.cs
+++ b/PoliNetwork.Graduatorie.Parser/Utils/Hashing.cs
@@ -1,6 +1,6 @@
 namespace PoliNetwork.Graduatorie.Parser.Utils;
 
-public class Hashing
+public static class Hashing
 {
     public static int? GetHashFromListHash(IReadOnlyCollection<int?>? iMerit)
     {
diff --git a/PoliNetwork.Graduatorie.Parser/Utils/Output/HashMatricoleWrite.cs b/PoliNetwork.Graduatorie.Parser/Utils/Output/HashMatricoleWrite.cs
index 38e00e90..76a10f20 100644
--- a/PoliNetwork.Graduatorie.Parser/Utils/Output/HashMatricoleWrite.cs
+++ b/PoliNetwork.Graduatorie.Parser/Utils/Output/HashMatricoleWrite.cs
@@ -18,9 +18,20 @@ public static void Write(RankingsSet? rankingsSet, string outFolder)
             return;
 
         var dictionary = GetDictToWrite(rankingsSet);
+        Sort2(dictionary);
         WriteToFile(dictionary, outFolder);
     }
 
+    private static void Sort2(SortedDictionary<string, StudentHashSummary> dict)
+    {
+        var keys = dict.Keys;
+        foreach (var key in keys)
+        {
+            var item = dict[key];
+            item.Sort2();
+        }
+    }
+
     private static SortedDictionary<string, StudentHashSummary> GetDictToWrite(RankingsSet rankingsSet)
     {
         var dictionary = new SortedDictionary<string, StudentHashSummary>();
diff --git a/PoliNetwork.Graduatorie.Parser/Utils/Output/RankingSummaryStudent.cs b/PoliNetwork.Graduatorie.Parser/Utils/Output/RankingSummaryStudent.cs
index 1bb43ca8..77f088cd 100644
--- a/PoliNetwork.Graduatorie.Parser/Utils/Output/RankingSummaryStudent.cs
+++ b/PoliNetwork.Graduatorie.Parser/Utils/Output/RankingSummaryStudent.cs
@@ -40,6 +40,27 @@ public RankingSummaryStudent(string? phase, SchoolEnum? school, int? year, Ranki
         Url = url;
     }
 
+    public int Compare(RankingSummaryStudent o)
+    {
+        var i = (Year ?? 0) - (o.Year ?? 0);
+        if (i != 0) return i < 0 ? -1 : 1;
+
+        i = string.CompareOrdinal(Course ?? "", o.Course ?? "");
+        if (i != 0) return i < 0 ? -1 : 1;
+
+        i = string.CompareOrdinal(Phase ?? "", o.Phase ?? "");
+        if (i != 0) return i < 0 ? -1 : 1;
+
+        i = (int)(School ?? SchoolEnum.Unknown) - (int)(o.School ?? SchoolEnum.Unknown);
+        if (i != 0) return i < 0 ? -1 : 1;
+
+        i = Url?.CompareTo(o.Url) ?? 0;
+        if (i != 0) return i < 0 ? -1 : 1;
+
+
+        return i;
+    }
+
     public override bool Equals(object? obj)
     {
         if (obj is not RankingSummaryStudent rankingSummaryStudent) return false;
diff --git a/PoliNetwork.Graduatorie.Parser/Utils/Output/StudentHashSummary.cs b/PoliNetwork.Graduatorie.Parser/Utils/Output/StudentHashSummary.cs
index 7e490321..c16c963a 100644
--- a/PoliNetwork.Graduatorie.Parser/Utils/Output/StudentHashSummary.cs
+++ b/PoliNetwork.Graduatorie.Parser/Utils/Output/StudentHashSummary.cs
@@ -41,4 +41,15 @@ public void Merge(StudentResult student, Ranking ranking, CourseTable? courseTab
         if (!present2)
             RankingSummaries.Add(r);
     }
+
+    public void Sort2()
+    {
+        RankingSummaries.Sort(Compare);
+        SingleCourseJsons.Sort(Compare);
+    }
+
+    private int Compare(RankingSummaryStudent a, RankingSummaryStudent b)
+    {
+        return a.Compare(b);
+    }
 }
\ No newline at end of file
diff --git a/PoliNetwork.Graduatorie.Scraper/Utils/Web/CheckUrlUtil.cs b/PoliNetwork.Graduatorie.Scraper/Utils/Web/CheckUrlUtil.cs
index d1ab1264..ab375a6c 100644
--- a/PoliNetwork.Graduatorie.Scraper/Utils/Web/CheckUrlUtil.cs
+++ b/PoliNetwork.Graduatorie.Scraper/Utils/Web/CheckUrlUtil.cs
@@ -7,7 +7,7 @@
 
 namespace PoliNetwork.Graduatorie.Scraper.Utils.Web;
 
-public class CheckUrlUtil
+public static class CheckUrlUtil
 {
     private static void CheckUrl(RankingUrl variable, HashSet<RankingUrl> final)
     {
diff --git a/PoliNetwork.Graduatorie.Scraper/Utils/Web/Scraper.cs b/PoliNetwork.Graduatorie.Scraper/Utils/Web/Scraper.cs
index 7aea2f6f..2b688648 100644
--- a/PoliNetwork.Graduatorie.Scraper/Utils/Web/Scraper.cs
+++ b/PoliNetwork.Graduatorie.Scraper/Utils/Web/Scraper.cs
@@ -138,8 +138,7 @@ private IEnumerable<string> UseHref(string? href)
     private IEnumerable<string> ParseNewsPage(string url)
     {
         HashSet<string> links = new();
-        if (_alreadyVisited.Contains(url)) return links;
-        _alreadyVisited.Add(url);
+        if (!_alreadyVisited.Add(url)) return links;
 
         var page = _web.Load(url).DocumentNode;
 
@@ -190,4 +189,4 @@ private bool IsValidText(string text)
             return null;
         }
     }
-}
+}
\ No newline at end of file