in order to use EF7 commands

Yavsc.Server/Helpers/BillingHelpers.cs

@@ -1,31 +0,0 @@
-using System.Collections.Generic;
-using System.Globalization;
-using System.IO;
-using System.Linq;
-using Yavsc.Abstract.FileSystem;
-using Yavsc.Billing;
-using Yavsc.Models.Billing;
-
-namespace Yavsc.Helpers
-{
-    public static class BillingHelpers
-    {
-        public static decimal Addition(this List<IBillItem> items) => items.Aggregate<IBillItem, decimal>(0m, (t, l) => t + l.Count * l.UnitaryCost);
-
-         public static decimal Addition(this List<CommandLine> items) => items.Select(i=>((IBillItem)i)).ToList().Addition();
-
-         public static string GetBillText(this IBillable query) {
-            string total = query.GetBillItems().Addition().ToString("C", CultureInfo.CurrentUICulture);
-            string bill = string.Join("\n", query.GetBillItems().Select(l=> $"{l.Name} {l.Description} : {l.UnitaryCost} € " + ((l.Count != 1) ? "*"+l.Count.ToString() : ""))) +
-                $"\n\nTotal: {total}";
-            return bill;
-         }
-
-         public static FileInfo GetBillInfo(this IBillable bill)
-         {
-             var suffix = bill.GetIsAcquitted() ? "-ack":null;
-             var filename = bill.GetFileBaseName()+".pdf";
-            return new FileInfo(Path.Combine(AbstractFileSystemHelpers.UserBillsDirName, filename));
-         }
-    }
-}