diff --git a/notus/Biblioteque_de_Class/Database.cs b/notus/Biblioteque_de_Class/Database.cs
index 7af6c30..7629ee6 100644
--- a/notus/Biblioteque_de_Class/Database.cs
+++ b/notus/Biblioteque_de_Class/Database.cs
@@ -19,7 +19,6 @@ namespace Biblioteque_de_Class
         public List<Theme> ThemeList { get; private set; }
         [DataMember]
         public List<User> UserList { get; private set; }
-        public static Theme? DefaultTheme { get; internal set; }
 
         public Database()
         {
@@ -142,25 +141,6 @@ namespace Biblioteque_de_Class
             ThemeList.Add(theme);
         }
 
-        /// <summary>
-        /// supprimer un theme dans la liste de theme
-        /// </summary>
-        public void RemoveTheme(Theme theme)
-        {
-            if (ThemeList.Contains(theme)) 
-            {
-                if (theme.Name.Length > 6 && theme.Name[..6] != "Static" )
-                {
-                    throw new AlreadyUsedException("This theme is used a default theme.");
-                }
-                ThemeList.Remove(theme);
-            }
-            else
-            {
-                throw new NotFoundException("Theme not found.");
-            }
-        }
-
         /// <summary>
         /// récupérer un theme
         /// </summary>
@@ -179,40 +159,6 @@ namespace Biblioteque_de_Class
             throw new NotFoundException("Theme not found.");
         }
 
-        /// <summary>
-        /// modifier le nom d'un theme
-        /// </summary>
-        public void ModifyThemeName(Theme theme, string newName)
-        {
-            foreach (Theme existingTheme in ThemeList)
-            {
-                if (existingTheme.Name == theme.Name)
-                {
-                    existingTheme.Name = newName;
-                    return;
-                }
-            }
-            throw new NotFoundException("Theme not found.");
-        }
-
-        /// <summary>
-        /// modifier la liste de couleur d'un theme
-        /// </summary>
-        public void ModifyThemeColorList(Theme theme, List<string> newColorList)
-        {
-            foreach (Theme existingTheme in ThemeList)
-            {
-                if (existingTheme.Name == theme.Name)
-                {
-                    for (int i = 0; i < 3; i++)
-                    {
-                        existingTheme.ChangeColor(existingTheme.ColorList[i], newColorList[i]);
-                    }
-                    return;
-                }
-            }
-        }
-
         /// <summary>
         /// changer le pseudo d'un utilisateur
         /// </summary>
@@ -231,9 +177,16 @@ namespace Biblioteque_de_Class
             user.Username = newUsername;
         }
 
-        public void SetDefaultTheme()
+        public bool VerifThemeNameNotTaken(string name)
         {
-            DefaultTheme = ThemeList[0];
+            foreach (Theme theme in ThemeList)
+            {
+                if (theme.Name == name)
+                {
+                    return false;
+                }
+            }
+            return true;
         }
     }
 }
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