diff --git a/Gremlin/Context.cs b/Gremlin/Context.cs
new file mode 100644
index 0000000..929949a
--- /dev/null
+++ b/Gremlin/Context.cs
@@ -0,0 +1,6 @@
+namespace Gremlin
+{
+    internal class Context
+    {
+    }
+}
\ No newline at end of file
diff --git a/Gremlin/GremlinData/DBClasses/DbHelper.cs b/Gremlin/GremlinData/DBClasses/DbHelper.cs
index be8cb94..f5b9281 100644
--- a/Gremlin/GremlinData/DBClasses/DbHelper.cs
+++ b/Gremlin/GremlinData/DBClasses/DbHelper.cs
@@ -5,22 +5,22 @@ using Microsoft.VisualBasic.FileIO;
 using MySqlConnector;
 using System;
 using System.Collections.Generic;
+using System.Diagnostics;
 using System.Data;
 using System.Globalization;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
 using System.Windows;
-using static Gremlin.GremlinData.EntityClasses.Enums;
 using Gremlin.GremlinUtilities;
 using Gremlin.GremlinData.EntityClasses;
+using static Gremlin.GremlinData.EntityClasses.Enums;
 
 namespace Gremlin.GremlinData.DBClasses
 {
     internal static class DbHelper
     {
         private static readonly DateTime FarInTheFuture = DateTime.Parse("2050-12-31t00:00:00.000000z", CultureInfo.CurrentCulture);
-        private static readonly ParallelOptions parallelOptions = new() { MaxDegreeOfParallelism = Environment.ProcessorCount * 2 };
 
         public static bool CheckDatabaseConnection(string connectionString)
         {
@@ -115,7 +115,7 @@ namespace Gremlin.GremlinData.DBClasses
 
                 using (GremlinContext db = new())
                 {
-                    _ = db.ProductLines.Add(PlToBeAdded);
+                    db.ProductLines.Add(PlToBeAdded);
                     db.SaveChanges();
                 }
             }
@@ -1049,7 +1049,8 @@ namespace Gremlin.GremlinData.DBClasses
                 //Eingelesenen Contacts in DB schreiben:
                 using (GremlinContext db = new())
                 {
-                    DateTime now = DateTime.Now;
+                    DateTime now;
+                    now = DateTime.Now;
 
                     foreach (Contact contact in ContactsReadFromFile)
                     {
@@ -1417,8 +1418,7 @@ namespace Gremlin.GremlinData.DBClasses
                 ////Counter für Debugging
                 //int x = 0;
 
-                //Multithreading
-                _ = Parallel.ForEach(NonNewProducts, parallelOptions, (product) =>
+                foreach (Product product in NonNewProducts)
                 {
                     ////Debugging-Counter
                     //x++;
@@ -1433,7 +1433,7 @@ namespace Gremlin.GremlinData.DBClasses
                     if (ExistingProduct == null)
                     {
                         NewProducts.Add(product);
-                        return;
+                        continue;
                     }
 
                     //Wenn keine Änderung, dann nur DataVersionComment mit CPL-Dateinamen aktualisieren...
@@ -1501,13 +1501,13 @@ namespace Gremlin.GremlinData.DBClasses
                         NewProducts.Add(UpdatedProduct);
                     }
                     UpdatedProducts.Add(ExistingProduct);
-                });
+                }
 
                 _ = InsertProducts(NewProducts);    //enthält auch ResolvePL()
                 db.Products.UpdateRange(ObsoleteProducts);
                 db.Products.UpdateRange(UpdatedProducts);
                 int changes = db.SaveChanges();
-                _ = MessageBox.Show($"Es wurden {changes} Änderungen an der Datenbank durchgeführt.\n Davon waren {UpdatedProducts.Count} UpdatedProducts, {ObsoleteProducts.Count} ObsoleteProducts und {NewProducts.Count} NewProducts");
+                Debug.WriteLine($"Es wurden {changes} Änderungen an der Datenbank durchgeführt.");
             }
 
             return true;
@@ -1952,10 +1952,10 @@ namespace Gremlin.GremlinData.DBClasses
         {
             try
             {
-                AccountType accountType = context.AccountTypes
-                    .Where(account => account.AccountTypeCode == AccTypeCode)
+                AccountType query = context.AccountTypes
+                    .Where(a => a.AccountTypeCode == AccTypeCode)
                     .First();
-                return accountType;
+                return query;
             }
             catch
             {
diff --git a/Gremlin/GremlinUI/Operations/LineItemOperations.cs b/Gremlin/GremlinUI/Operations/LineItemOperations.cs
deleted file mode 100644
index c6668ad..0000000
--- a/Gremlin/GremlinUI/Operations/LineItemOperations.cs
+++ /dev/null
@@ -1,15 +0,0 @@
-using Gremlin.GremlinData.EntityClasses;
-
-namespace Gremlin.Operations
-{
-    public class LineItemOperations
-    {
-        public static string ToTex(LineItem lineItem)
-        {
-            Product product = lineItem.GetProduct();
-            return lineItem.OptionNumber == ""
-                ? $"{lineItem.Position} &\\textbf{{{product.CustomDescription.Heading}}} ({lineItem.ProductNumber})\\newline {product.CustomDescription.DescriptionText}&{lineItem.Amount}&\\SI{{{lineItem.Total}}}{{\\sieuro}}\\\\"
-                : $"{lineItem.Position} &\\textbf{{{product.CustomDescription.Heading}}} ({lineItem.ProductNumber}\\#{lineItem.OptionNumber})\\newline {product.CustomDescription.DescriptionText}&{lineItem.Amount}&\\SI{{{lineItem.Total}}}{{\\sieuro}}\\\\";
-        }
-    }
-}
\ No newline at end of file
diff --git a/Gremlin/GremlinUI/Operations/TexFileHandler.cs b/Gremlin/GremlinUI/Operations/TexFileHandler.cs
index 3597657..984c14f 100644
--- a/Gremlin/GremlinUI/Operations/TexFileHandler.cs
+++ b/Gremlin/GremlinUI/Operations/TexFileHandler.cs
@@ -123,14 +123,5 @@ namespace Gremlin.Operations
             return anschreibenListe;
         }
 
-        //public static decimal GetSum(List<LineItem> quote)
-        //{
-        //    decimal gesamtnetto = new();
-        //    foreach (LineItem lineItem in quote)
-        //    {
-        //        gesamtnetto += lineItem.ListPrice;
-        //    }
-        //    return gesamtnetto;
-        //}
     }
 }