diff --git a/ElectronicsShop/ElectronicsShop.sln b/ElectronicsShop/ElectronicsShop.sln
index fbdc137..36142e6 100644
--- a/ElectronicsShop/ElectronicsShop.sln
+++ b/ElectronicsShop/ElectronicsShop.sln
@@ -7,6 +7,8 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "ElectronicsShopDataModels",
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "ElectronicsShopContracts", "ElectronicsShopContracts\ElectronicsShopContracts.csproj", "{69411E41-F304-4D1B-8F15-48DD08585C7A}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ElectronicsShopBusinessLogic", "ElectronicsShopBusinessLogic\ElectronicsShopBusinessLogic.csproj", "{0CCDB712-EE03-4050-AC4B-4315FF14ABD2}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -21,6 +23,10 @@ Global
 		{69411E41-F304-4D1B-8F15-48DD08585C7A}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{69411E41-F304-4D1B-8F15-48DD08585C7A}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{69411E41-F304-4D1B-8F15-48DD08585C7A}.Release|Any CPU.Build.0 = Release|Any CPU
+		{0CCDB712-EE03-4050-AC4B-4315FF14ABD2}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{0CCDB712-EE03-4050-AC4B-4315FF14ABD2}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{0CCDB712-EE03-4050-AC4B-4315FF14ABD2}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{0CCDB712-EE03-4050-AC4B-4315FF14ABD2}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
diff --git a/ElectronicsShop/ElectronicsShopBusinessLogic/BusinessLogic/ClientLogic.cs b/ElectronicsShop/ElectronicsShopBusinessLogic/BusinessLogic/ClientLogic.cs
new file mode 100644
index 0000000..8798048
--- /dev/null
+++ b/ElectronicsShop/ElectronicsShopBusinessLogic/BusinessLogic/ClientLogic.cs
@@ -0,0 +1,125 @@
+using ElectronicsShopContracts.BindingModels;
+using ElectronicsShopContracts.BusinessLogicContracts;
+using ElectronicsShopContracts.SearchModels;
+using ElectronicsShopContracts.ViewModels;
+using Microsoft.Extensions.Logging;
+using System;
+using System.Collections.Generic;
+using System.Data;
+using System.Linq;
+using System.Runtime.CompilerServices;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ElectronicsShopBusinessLogic.BusinessLogic
+{
+    public class ClientLogic : IClientLogic
+    {
+        private readonly ILogger _logger;
+        //private readonly IClientStorage _storage;
+
+        // todo нет интерфейса хранилища  
+        public ClientLogic(ILogger logger) {
+            _logger = logger;
+            //storage = _storage;
+        }
+
+        public bool Add(ClientBindingModel model)
+        {
+            CheckModel(model);
+            // todo логика добавления в _clientStorage:_clientStorage.Insert(model) == null
+            if (model == null) {
+                _logger.LogWarning("Add operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        public bool Update(ClientBindingModel model)
+        {
+            CheckModel(model);
+            // todo логика добавления в _clientStorage:_clientStorage.Update(model) == null
+            if (model == null)
+            {
+                _logger.LogWarning("Update operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        public bool Delete(ClientBindingModel model)
+        {
+            CheckModel(model, false);
+            _logger.LogInformation($"Delete.ID:{model.UserID}");
+            // todo логика добавления в _clientStorage:_clientStorage.Delete(model) == null
+            if (model == null) {
+                _logger.LogWarning("Delete operation failes");
+                return false;
+            }
+            return true;
+
+        }
+
+        public ClientViewModel? ReadElemet(ClientSearchModel? model)
+        {
+            if (model == null) {
+                throw new ArgumentNullException(nameof(model));
+            }
+            _logger.LogInformation($"ReadElement: logint:{ model.Login}.ID:{model.UserID}");
+            // todo element = _clientStorage.GetElement(model);
+            var element = model;
+            if (element == null) {
+                _logger.LogWarning("ReadElement: element not fount");
+                return null;
+            }
+            _logger.LogInformation($"ReadElement: find.ID:{element.UserID}");
+            // todo retun element;
+            return null;
+        }
+
+        public List<ClientViewModel>? ReadList(ClientSearchModel? model)
+        {
+            
+            _logger.LogInformation($"ReadList: ClientID:{model?.UserID}");
+            // todo получение списка из хранилища,  model == null ? _clientStorage.GetFullList() : _clientStorage.GetFilteredList(model);
+            var list = model;
+            if (list == null) {
+                _logger.LogWarning("ReadList: return null list");
+                return null;
+            }
+            // toto ReadList. Count:{Count}, list.count
+            _logger.LogInformation("ReadList: Count:{Count}");
+            // todo return list;
+            return null;
+        }
+
+        private void CheckModel(ClientBindingModel model, bool withParams = true) { 
+            if (model == null) {
+                throw new ArgumentNullException(nameof(model));
+            }
+            if (!withParams) {
+                return;
+            }
+            if (string.IsNullOrEmpty(model.Login)) {
+                throw new ArgumentNullException("Нет логина пользователя", nameof(model.Login));
+            }
+            if (string.IsNullOrEmpty(model.FirstName)) {
+                throw new ArgumentNullException("Нет имени пользователя", nameof(model.FirstName));
+            }
+            if (string.IsNullOrEmpty(model.LastName)) {
+                throw new ArgumentNullException("Нет фамилии пользоватея", nameof(model.LastName));
+            }
+            if (string.IsNullOrEmpty(model.Email)) {
+                throw new ArgumentNullException("Нет почты клиента", nameof(model.Email));
+            }
+            if (string.IsNullOrEmpty(model.Password)) { 
+                throw new ArgumentNullException("Нет пароля пользователя", nameof (model.Password));
+            }
+            if (string.IsNullOrEmpty(model.PhoneNumber)) {
+                throw new ArgumentNullException("Нет номер телефона пользователя", nameof(model.PhoneNumber));
+            }
+            _logger.LogInformation($"Client: Login:{model.Login}.FirstName:{model.FirstName}.LastName:{model.LastName}.Email:{model.Email}." +
+                                    $"Password:{model.Password}.PhoneNumber:{model.PhoneNumber}");
+        }
+    }
+}
diff --git a/ElectronicsShop/ElectronicsShopBusinessLogic/ElectronicsShopBusinessLogic.csproj b/ElectronicsShop/ElectronicsShopBusinessLogic/ElectronicsShopBusinessLogic.csproj
new file mode 100644
index 0000000..39bc039
--- /dev/null
+++ b/ElectronicsShop/ElectronicsShopBusinessLogic/ElectronicsShopBusinessLogic.csproj
@@ -0,0 +1,17 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="8.0.1" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\ElectronicsShopContracts\ElectronicsShopContracts.csproj" />
+  </ItemGroup>
+
+</Project>
diff --git a/ElectronicsShop/ElectronicsShopContracts/SearchModels/ClientSearchModel.cs b/ElectronicsShop/ElectronicsShopContracts/SearchModels/ClientSearchModel.cs
index c64d20c..206e3fd 100644
--- a/ElectronicsShop/ElectronicsShopContracts/SearchModels/ClientSearchModel.cs
+++ b/ElectronicsShop/ElectronicsShopContracts/SearchModels/ClientSearchModel.cs
@@ -8,7 +8,7 @@ namespace ElectronicsShopContracts.SearchModels
 {
     public class ClientSearchModel
     {
-        public int? ID { get; set; }
+        public int? UserID { get; set; }
         public string? Login { get; set; }
     }
 }
diff --git a/ElectronicsShop/ElectronicsShopContracts/SearchModels/ShopAssistentSearchModel.cs b/ElectronicsShop/ElectronicsShopContracts/SearchModels/ShopAssistentSearchModel.cs
index e5096c9..9c495e9 100644
--- a/ElectronicsShop/ElectronicsShopContracts/SearchModels/ShopAssistentSearchModel.cs
+++ b/ElectronicsShop/ElectronicsShopContracts/SearchModels/ShopAssistentSearchModel.cs
@@ -8,7 +8,7 @@ namespace ElectronicsShopContracts.SearchModels
 {
     public class ShopAssistentSearchModel
     {
-        public int? ID { get; set; }
+        public int? UserID { get; set; }
         public string? Login { get; set; }
     }
 }