diff --git a/WinFormSolution/Components/UserControlTreeView.cs b/WinFormSolution/Components/UserControlTreeView.cs
index 52a3623..2b94e06 100644
--- a/WinFormSolution/Components/UserControlTreeView.cs
+++ b/WinFormSolution/Components/UserControlTreeView.cs
@@ -35,7 +35,7 @@ namespace Components
                 throw new NotSelectedNodeException();
             }
 
-            if ((Hierarchy?.Count ?? 0) > 0)
+            if ((Hierarchy?.Count ?? 0) == 0)
             {
                 throw new TreeHierarchyNotSetException();
             }
@@ -83,7 +83,7 @@ namespace Components
                 return;
             }
 
-            if ((Hierarchy?.Count ?? 0) > 0)
+            if ((Hierarchy?.Count ?? 0) == 0)
             {
                 throw new TreeHierarchyNotSetException();
             }
diff --git a/WinFormSolution/WinFormsApp/Form.cs b/WinFormSolution/WinFormsApp/Form.cs
index 0cfa343..839d869 100644
--- a/WinFormSolution/WinFormsApp/Form.cs
+++ b/WinFormSolution/WinFormsApp/Form.cs
@@ -45,12 +45,13 @@ namespace WinFormsApp
             employees.Add(new Employee("Отдел финансов", "Аналитик", "Астафьев", "Павел"));
             employees.Add(new Employee("Отдел закупок", "Аналитик", "Смирнова", "Анастасия"));
 
-            List<(string PropertyName, bool AlwaysCreateBranch)> hierarchy = new();
-
-            hierarchy.Add(("Departament", false));
-            hierarchy.Add(("Position", false));
-            hierarchy.Add(("Surname", false));
-            hierarchy.Add(("Name", false));
+            List<(string PropertyName, bool AlwaysCreateBranch)> hierarchy =
+            [
+                ("Departament", false),
+                ("Position", false),
+                ("Surname", false),
+                ("Name", false),
+            ];
 
             userControlTreeView.SetHierarchy(hierarchy);