diff --git a/ChatController/Utilities/Utils.cs b/ChatController/Utilities/Utils.cs
index 6ab242e..e31d8cb 100644
--- a/ChatController/Utilities/Utils.cs
+++ b/ChatController/Utilities/Utils.cs
@@ -43,10 +43,6 @@ namespace ChatController.Utilities
         /// <param name="callback">Callback-Methode, die nach dem Herunterladen des Bildes aufgerufen wird und das Bild zurückgibt. Fügt das Bild der GUI hinzu.</param>
         private static void DownloadImage(string uri, Action<ImageSource> callback)
         {
-#if DEBUG
-            Debug.WriteLine($"####{uri} wird heruntergeladen (Utils.DownloadImage) ...");
-#endif
-
             var client = new RestClient(uri);
             var request = new RestRequest
             {
@@ -386,7 +382,7 @@ namespace ChatController.Utilities
             return 100;
         }
 
-        private static readonly Regex _UrlRegex = new Regex(@"(?#Protocol)(http(?:s?)\:(\/\/|\\\\)|(w){3}(2|3)?\.{1})(?#Subdomains)(?:(?:[-\w]+\.)+(?#TopLevel Domains)(?:com|org|net|gov|mil|biz|info|mobi|name|aero|jobs|museum|travel|[a-z]{2}))(?#Port)(?::[\d]{1,5})?(?#Directories)(?:(?:(?:/(?:[-\w~!$+|.,=]|%[a-f\d]{2})+)+|/)+|\?|#)?(?#Query)(?:(?:\?(?:[-\w~!$+|.,*:]|%[a-f\d{2}])+=(?:[-\w~!$+|.,*:=]|%[a-f\d]{2})*)(?:&amp;(?:[-\w~!$+|.,*:]|%[a-f\d{2}])+=(?:[-\w~!$+|.,*:=]|%[a-f\d]{2})*)*)*(?#Anchor)(?:#(?:[-\w~!$+|.,*:=]|%[a-f\d]{2})*)?", RegexOptions.Compiled | RegexOptions.IgnoreCase);
+        private static readonly Regex UrlRegex = new Regex(@"(?#Protocol)(http(?:s?)\:(\/\/|\\\\)|(w){3}(2|3)?\.{1})(?#Subdomains)(?:(?:[-\w]+\.)+(?#TopLevel Domains)(?:com|org|net|gov|mil|biz|info|mobi|name|aero|jobs|museum|travel|[a-z]{2}))(?#Port)(?::[\d]{1,5})?(?#Directories)(?:(?:(?:/(?:[-\w~!$+|.,=]|%[a-f\d]{2})+)+|/)+|\?|#)?(?#Query)(?:(?:\?(?:[-\w~!$+|.,*:]|%[a-f\d{2}])+=(?:[-\w~!$+|.,*:=]|%[a-f\d]{2})*)(?:&amp;(?:[-\w~!$+|.,*:]|%[a-f\d{2}])+=(?:[-\w~!$+|.,*:=]|%[a-f\d]{2})*)*)*(?#Anchor)(?:#(?:[-\w~!$+|.,*:=]|%[a-f\d]{2})*)?", RegexOptions.Compiled | RegexOptions.IgnoreCase);
 
         public static ObservableCollection<Inline> ConvertLinksToHyperlinks(string messageText)
         {
@@ -400,7 +396,7 @@ namespace ChatController.Utilities
             var guidString = Guid.NewGuid().ToString();
             var replacementString = Guid.NewGuid().ToString();
 
-            var matches = _UrlRegex.Matches(messageText);
+            var matches = UrlRegex.Matches(messageText);
 
             var index2Link = new Dictionary<int, Hyperlink>();
 
@@ -427,7 +423,7 @@ namespace ChatController.Utilities
                 index2Link[i] = hyperlink;
             }
 
-            var splitMessage = _UrlRegex.Replace(messageText, replacementString + guidString).Split(new[] { guidString }, StringSplitOptions.None);
+            var splitMessage = UrlRegex.Replace(messageText, replacementString + guidString).Split(new[] { guidString }, StringSplitOptions.None);
 
             var linkIndex = 0;
             foreach(var text in splitMessage)
@@ -463,46 +459,8 @@ namespace ChatController.Utilities
             return result;
         }
 
-        public static string GetUserIdFromProfilePictureUri(string uri)
-        {
-#if DEBUG
-            if(string.IsNullOrWhiteSpace(uri))
-            {
-                return uri;
-            }
-
-            string userId = null;
-            var splitUri = uri.Split('/');
-            if(splitUri.Length <= 0)
-            {
-                return null;
-            }
-
-            var lastIndex = splitUri.Length - 1;
-            var fileName = splitUri[lastIndex];
-            var splitFileName = fileName.Split('_');
-
-            if(splitFileName.Length > 0)
-            {
-                userId = long.TryParse(splitFileName[0], out var unused) ? splitFileName[0] : fileName;
-            }
-
-            return userId;
-#endif
-        }
-
         public static ImageSource DownloadImageSync(string uri, long? userId, int? groupId)
         {
-            var userOrGroup = "FEHLER: USER-ID UND GROUP-ID SIND NULL!";
-            if(groupId.HasValue && userId is null)
-            {
-                userOrGroup = $"GroupId {groupId}";
-            }
-            else if(groupId is null && userId.HasValue)
-            {
-                userOrGroup = $"UserId {userId}";
-            }
-
             var cache = OwnChatCache.GetInstance();
 
             if(cache.IsAvatarInCache(uri, userId, groupId))
@@ -510,8 +468,6 @@ namespace ChatController.Utilities
                 return cache.GetAvatar(uri, userId, groupId);
             }
 
-            Debug.WriteLine($"####Lade {uri} für {userOrGroup} herunter ...");
-
             var request = WebRequest.Create(uri);
             request.Credentials = CredentialCache.DefaultCredentials;
             request.Headers[Constants.Token] = AuthToken;
@@ -519,7 +475,7 @@ namespace ChatController.Utilities
 
             using(var response = request.GetResponse())
             {
-                var responseStream = response?.GetResponseStream();
+                var responseStream = response.GetResponseStream();
 
                 if(responseStream is null)
                 {