diff --git a/Course/BusinessLogic/BusinessLogic/DetailLogic.cs b/Course/BusinessLogic/BusinessLogic/DetailLogic.cs
new file mode 100644
index 0000000..85666a5
--- /dev/null
+++ b/Course/BusinessLogic/BusinessLogic/DetailLogic.cs
@@ -0,0 +1,110 @@
+using Contracts.BindingModels;
+using Contracts.BusinessLogicsContracts;
+using Contracts.SearchModels;
+using Contracts.StoragesContracts;
+using Contracts.ViewModels;
+using Microsoft.Extensions.Logging;
+using System.Xml.Linq;
+
+namespace BusinessLogic.BusinessLogic
+{
+    public class DetailLogic : IDetailLogic
+    {
+        private readonly ILogger _logger;
+        private readonly IDetailStorage _detailStorage;
+        public DetailLogic(ILogger<DetailLogic> logger, IDetailStorage detailStorage)
+        {
+            _logger = logger;
+            _detailStorage = detailStorage;
+        }
+        public List<DetailViewModel>? ReadList(DetailSearchModel? model)
+        {
+            _logger.LogInformation("ReadList. DetailName:{name}. Id:{Id}", model.Name, model.Id);
+            var list = model == null ? _detailStorage.GetFullList() : _detailStorage.GetFilteredList(model);
+            if (list == null)
+            {
+                _logger.LogWarning("ReadList return null list");
+                return null;
+            }
+            _logger.LogWarning("ReadList. Count:{Count}", list.Count);
+            return list;
+        }
+        public DetailViewModel? ReadElement(DetailSearchModel? model)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            _logger.LogInformation("ReadElement. DetailName:{Name}. Id:{Id}", model.Name, model.Id);
+            var elem = _detailStorage.GetElement(model);
+            if (elem == null)
+            {
+                _logger.LogWarning("ReadElement element not found");
+                return null;
+            }
+            _logger.LogInformation("ReadElement find. Id:{Id}", elem.Id);
+            return elem;
+        }
+
+
+        private void CheckModel(DetailBindingModel? model, bool withParams = true)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            if (!withParams)
+            {
+                return;
+            }
+            if (string.IsNullOrEmpty(model.Name))
+            {
+                throw new ArgumentNullException("Нет названия детали", nameof(model.Name));
+            }
+            if (model.Cost <= 0)
+            {
+                throw new ArgumentNullException("Цена детали должна быть больше 0", nameof(model.Cost));
+            }
+            _logger.LogInformation("Detail. DetailName:{Name}. Cost:{Cost}. Id:{Id}", model.Name, model.Cost, model.Id);
+            var elem = _detailStorage.GetElement(new DetailSearchModel
+            {
+                Name = model.Name
+            });
+            if (elem != null && elem.Id != model.Id)
+            {
+                throw new InvalidOperationException("Деталь с таким названием уже существует");
+            }
+        }
+        public bool Create(DetailBindingModel? model)
+        {
+            CheckModel(model);
+            if (_detailStorage.Insert(model!) == null)
+            {
+                _logger.LogWarning("Insert error");
+                return false;
+            }
+            return true;
+        }
+        public bool Update(DetailBindingModel? model)
+        {
+            CheckModel(model);
+            if (_detailStorage.Update(model!) == null)
+            {
+                _logger.LogWarning("Update error");
+                return false;
+            }
+            return true;
+        }
+        public bool Delete(DetailBindingModel? model)
+        {
+            CheckModel(model, false);
+            _logger.LogInformation("Delete Id:{Id}", model!.Id);
+            if (_detailStorage.Delete(model!) == null)
+            {
+                _logger.LogWarning("Delete error");
+                return false;
+            }
+            return true;
+        }
+    }
+}
diff --git a/Course/BusinessLogic/DetailLogic.cs b/Course/BusinessLogic/DetailLogic.cs
deleted file mode 100644
index d4aa38d..0000000
--- a/Course/BusinessLogic/DetailLogic.cs
+++ /dev/null
@@ -1,110 +0,0 @@
-using Contracts.BindingModels;
-using Contracts.BusinessLogicsContracts;
-using Contracts.SearchModels;
-using Contracts.StoragesContracts;
-using Contracts.ViewModels;
-using Microsoft.Extensions.Logging;
-using System.Xml.Linq;
-
-namespace BusinessLogic
-{
-	public class DetailLogic : IDetailLogic
-	{
-		private readonly ILogger _logger;
-		private readonly IDetailStorage _detailStorage;
-		public DetailLogic(ILogger<DetailLogic> logger, IDetailStorage detailStorage)
-		{
-			_logger = logger;
-			_detailStorage = detailStorage;
-		}
-		public List<DetailViewModel>? ReadList(DetailSearchModel? model)
-		{
-			_logger.LogInformation("ReadList. DetailName:{name}. Id:{Id}", model.Name, model.Id);
-			var list = model == null ? _detailStorage.GetFullList() : _detailStorage.GetFilteredList(model);
-			if (list == null)
-			{
-				_logger.LogWarning("ReadList return null list");
-				return null;
-			}
-			_logger.LogWarning("ReadList. Count:{Count}", list.Count);
-			return list;
-		}
-		public DetailViewModel? ReadElement(DetailSearchModel? model)
-		{
-			if (model == null)
-			{
-				throw new ArgumentNullException(nameof(model));
-			}
-			_logger.LogInformation("ReadElement. DetailName:{Name}. Id:{Id}", model.Name, model.Id);
-			var elem = _detailStorage.GetElement(model);
-			if (elem == null)
-			{
-				_logger.LogWarning("ReadElement element not found");
-				return null;
-			}
-			_logger.LogInformation("ReadElement find. Id:{Id}", elem.Id);
-			return elem;
-		}
-
-		
-		private void CheckModel(DetailBindingModel? model, bool withParams = true)
-		{
-			if (model == null)
-			{
-				throw new ArgumentNullException(nameof(model));
-			}
-			if (!withParams)
-			{
-				return;
-			}
-			if (string.IsNullOrEmpty(model.Name))
-			{
-				throw new ArgumentNullException("Нет названия детали", nameof(model.Name));
-			}
-			if (model.Cost <= 0)
-			{
-				throw new ArgumentNullException("Цена детали должна быть больше 0", nameof(model.Cost));
-			}
-			_logger.LogInformation("Detail. DetailName:{Name}. Cost:{Cost}. Id:{Id}", model.Name, model.Cost, model.Id);
-			var elem = _detailStorage.GetElement(new DetailSearchModel
-			{
-				Name = model.Name
-			});
-			if (elem != null && elem.Id != model.Id)
-			{
-				throw new InvalidOperationException("Деталь с таким названием уже существует");
-			}
-		}
-		public bool Create(DetailBindingModel? model)
-		{
-			CheckModel(model);
-			if (_detailStorage.Insert(model!) == null)
-			{
-				_logger.LogWarning("Insert error");
-				return false;
-			}
-			return true;
-		}
-		public bool Update(DetailBindingModel? model)
-		{
-			CheckModel(model);
-			if (_detailStorage.Update(model!) == null)
-			{
-				_logger.LogWarning("Update error");
-				return false;
-			}
-			return true;
-		}
-		public bool Delete(DetailBindingModel? model)
-		{
-			CheckModel(model, false);
-			_logger.LogInformation("Delete Id:{Id}", model!.Id);
-			if (_detailStorage.Delete(model!) == null)
-			{
-				_logger.LogWarning("Delete error");
-				return false;
-			}
-			return true;
-		}
-	}
-}