diff --git a/University/UniversityBuisnessLogic/BuisnessLogic/ActivityLogic.cs b/University/UniversityBuisnessLogic/BuisnessLogic/ActivityLogic.cs
new file mode 100644
index 0000000..a145745
--- /dev/null
+++ b/University/UniversityBuisnessLogic/BuisnessLogic/ActivityLogic.cs
@@ -0,0 +1,102 @@
+using UniversityContracts.BindingModels;
+using UniversityContracts.BuisnessLogicContracts;
+using UniversityContracts.SearchModels;
+using UniversityContracts.StoragesContracts;
+using UniversityContracts.ViewModels;
+using Microsoft.Extensions.Logging;
+
+namespace UniversityBuisnessLogic.BuisnessLogic
+{
+    public class ActivityLogic : IActivityLogic
+    {
+        private readonly ILogger _logger;
+        private readonly IActivityStorage _activityStorage;
+
+        public ActivityLogic(ILogger<ActivityLogic> logger, IActivityStorage activityStorage)
+        {
+            _logger = logger;
+            _activityStorage = activityStorage;
+        }
+        public bool Create(ActivityBindingModel model)
+        {
+            CheckModel(model);
+            if (_activityStorage.Insert(model) == null)
+            {
+                _logger.LogWarning("Insert operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        public bool Delete(ActivityBindingModel model)
+        {
+            CheckModel(model, false);
+            _logger.LogInformation("Delete. Id:{Id}", model.Id);
+            if (_activityStorage.Delete(model) == null)
+            {
+                _logger.LogWarning("Delete operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        public ActivityViewModel? ReadElement(ActivitySearchModel model)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            _logger.LogInformation("ReadElement. Id:{Id}", model.Id);
+            var element = _activityStorage.GetElement(model);
+            if (element == null)
+            {
+                _logger.LogWarning("ReadElement element not found");
+                return null;
+            }
+            _logger.LogInformation("ReadElement find. Id:{Id}", element.Id);
+            return element;
+        }
+
+        public List<ActivityViewModel>? ReadList(ActivitySearchModel? model)
+        {
+            _logger.LogInformation("ReadList. Id:{Id}", model?.Id);
+            var list = model == null ? _activityStorage.GetFullList() : _activityStorage.GetFilteredList(model);
+            if (list == null)
+            {
+                _logger.LogWarning("ReadList return null list");
+                return null;
+            }
+            _logger.LogInformation("ReadList. Count:{Count}", list.Count);
+            return list;
+        }
+
+        public bool Update(ActivityBindingModel model)
+        {
+            CheckModel(model);
+            if (_activityStorage.Update(model) == null)
+            {
+                _logger.LogWarning("Update operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        private void CheckModel(ActivityBindingModel model, bool withParams = true)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            if (!withParams)
+            {
+                return;
+            }
+            if (model.Number <= 0)
+            {
+                throw new ArgumentNullException("Номер занятия должен быть больше 0", nameof(model.Number));
+            }
+
+            _logger.LogInformation("Activity. Number:{ComponentName}. Id: {Id}", model.Number, model.Id);
+        }
+    }
+}
diff --git a/University/UniversityBuisnessLogic/BuisnessLogic/DisciplineLogic.cs b/University/UniversityBuisnessLogic/BuisnessLogic/DisciplineLogic.cs
new file mode 100644
index 0000000..af96521
--- /dev/null
+++ b/University/UniversityBuisnessLogic/BuisnessLogic/DisciplineLogic.cs
@@ -0,0 +1,117 @@
+using UniversityContracts.BindingModels;
+using UniversityContracts.BuisnessLogicContracts;
+using UniversityContracts.SearchModels;
+using UniversityContracts.StoragesContracts;
+using UniversityContracts.ViewModels;
+using Microsoft.Extensions.Logging;
+
+namespace UniversityBuisnessLogic.BuisnessLogic
+{
+    public class DisciplineLogic : IDisciplineLogic
+    {
+        private readonly ILogger _logger;
+        private readonly IDisciplineStorage _disciplineStorage;
+
+        public DisciplineLogic(ILogger<DisciplineLogic> logger, IDisciplineStorage disciplineStorage)
+        {
+            _logger = logger;
+            _disciplineStorage = disciplineStorage;
+        }
+
+        public bool Create(DisciplineBindingModel model)
+        {
+            CheckModel(model);
+            if (_disciplineStorage.Insert(model) == null)
+            {
+                _logger.LogWarning("Insert operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        public bool Delete(DisciplineBindingModel model)
+        {
+            CheckModel(model, false);
+            _logger.LogInformation("Delete. Id:{Id}", model.Id);
+            if (_disciplineStorage.Delete(model) == null)
+            {
+                _logger.LogWarning("Delete operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        public DisciplineViewModel? ReadElement(DisciplineSearchModel model)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            _logger.LogInformation("ReadElement. DisciplineName:{Name}. Id:{Id}", model.Name, model.Id);
+            var element = _disciplineStorage.GetElement(model);
+            if (element == null)
+            {
+                _logger.LogWarning("ReadElement element not found");
+                return null;
+            }
+            _logger.LogInformation("ReadElement find. Id:{Id}", element.Id);
+            return element;
+        }
+
+        public List<DisciplineViewModel>? ReadList(DisciplineSearchModel? model)
+        {
+            _logger.LogInformation("ReadList. DisciplineName: {Name}. Id:{Id}", model?.Name, model?.Id);
+            var list = model == null ? _disciplineStorage.GetFullList() : _disciplineStorage.GetFilteredList(model);
+            if (list == null)
+            {
+                _logger.LogWarning("ReadList return null list");
+                return null;
+            }
+            _logger.LogInformation("ReadList. Count:{Count}", list.Count);
+            return list;
+        }
+
+        public bool Update(DisciplineBindingModel model)
+        {
+            CheckModel(model);
+            if (_disciplineStorage.Update(model) == null)
+            {
+                _logger.LogWarning("Update operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        private void CheckModel(DisciplineBindingModel 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 дисциплины", nameof(model.Name));
+            }
+            if (string.IsNullOrEmpty(model.Department))
+            {
+                throw new ArgumentNullException("Нет названия кафедры", nameof(model.Name));
+            }
+
+            _logger.LogInformation("Discipline. Name:{Name}. Department:{Department}. Id: {Id}", model.Name, model.Department, model.Id);
+
+            var element = _disciplineStorage.GetElement(new DisciplineSearchModel
+            {
+                Name = model.Name
+            });
+
+            if (element != null && element.Id != model.Id)
+            {
+                throw new InvalidOperationException("Дисциплина с таким названием уже есть");
+            }
+        }
+    }
+}
diff --git a/University/UniversityBuisnessLogic/BuisnessLogic/ExaminationResultLogic.cs b/University/UniversityBuisnessLogic/BuisnessLogic/ExaminationResultLogic.cs
new file mode 100644
index 0000000..51657c3
--- /dev/null
+++ b/University/UniversityBuisnessLogic/BuisnessLogic/ExaminationResultLogic.cs
@@ -0,0 +1,103 @@
+using UniversityContracts.BindingModels;
+using UniversityContracts.BuisnessLogicContracts;
+using UniversityContracts.SearchModels;
+using UniversityContracts.StoragesContracts;
+using UniversityContracts.ViewModels;
+using Microsoft.Extensions.Logging;
+
+namespace UniversityBuisnessLogic.BuisnessLogic
+{
+    public class ExaminationResultLogic : IExaminationResultLogic
+    {
+        private readonly ILogger _logger;
+        private readonly IExaminationResultStorage _examinationResultStorage;
+
+        public ExaminationResultLogic(ILogger<ExaminationResultLogic> logger, IExaminationResultStorage examinationResultStorage)
+        {
+            _logger = logger;
+            _examinationResultStorage = examinationResultStorage;
+        }
+
+        public bool Create(ExaminationResultBindingModel model)
+        {
+            CheckModel(model);
+            if (_examinationResultStorage.Insert(model) == null)
+            {
+                _logger.LogWarning("Insert operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        public bool Delete(ExaminationResultBindingModel model)
+        {
+            CheckModel(model, false);
+            _logger.LogInformation("Delete. Id:{Id}", model.Id);
+            if (_examinationResultStorage.Delete(model) == null)
+            {
+                _logger.LogWarning("Delete operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        public ExaminationResultViewModel? ReadElement(ExaminationResultSearchModel model)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            _logger.LogInformation("ReadElement. Id:{Id}", model.Id);
+            var element = _examinationResultStorage.GetElement(model);
+            if (element == null)
+            {
+                _logger.LogWarning("ReadElement element not found");
+                return null;
+            }
+            _logger.LogInformation("ReadElement find. Id:{Id}", element.Id);
+            return element;
+        }
+
+        public List<ExaminationResultViewModel>? ReadList(ExaminationResultSearchModel? model)
+        {
+            _logger.LogInformation("ReadList. Id:{Id}", model?.Id);
+            var list = model == null ? _examinationResultStorage.GetFullList() : _examinationResultStorage.GetFilteredList(model);
+            if (list == null)
+            {
+                _logger.LogWarning("ReadList return null list");
+                return null;
+            }
+            _logger.LogInformation("ReadList. Count:{Count}", list.Count);
+            return list;
+        }
+
+        public bool Update(ExaminationResultBindingModel model)
+        {
+            CheckModel(model);
+            if (_examinationResultStorage.Update(model) == null)
+            {
+                _logger.LogWarning("Update operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        private void CheckModel(ExaminationResultBindingModel model, bool withParams = true)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            if (!withParams)
+            {
+                return;
+            }
+            if (string.IsNullOrEmpty(model.ExaminationForm))
+            {
+                throw new ArgumentNullException("Нет формы испытания", nameof(model.ExaminationForm));
+            }
+
+            _logger.LogInformation("ExaminationResult. ExaminationForm: {ExaminationForm}. Id: {Id}", model.ExaminationForm, model.Id);
+        }
+    }
+}
diff --git a/University/UniversityBuisnessLogic/BuisnessLogic/ReportTypeLogic.cs b/University/UniversityBuisnessLogic/BuisnessLogic/ReportTypeLogic.cs
new file mode 100644
index 0000000..d7120ee
--- /dev/null
+++ b/University/UniversityBuisnessLogic/BuisnessLogic/ReportTypeLogic.cs
@@ -0,0 +1,112 @@
+using UniversityContracts.BindingModels;
+using UniversityContracts.BuisnessLogicContracts;
+using UniversityContracts.SearchModels;
+using UniversityContracts.StoragesContracts;
+using UniversityContracts.ViewModels;
+using Microsoft.Extensions.Logging;
+
+namespace UniversityBuisnessLogic.BuisnessLogic
+{
+    public class ReportTypeLogic : IReportTypeLogic
+    {
+        private readonly ILogger _logger;
+        private readonly IReportTypeStorage _reportTypeStorage;
+
+        public ReportTypeLogic(ILogger<ReportTypeLogic> logger, IReportTypeStorage reportTypeStorage)
+        {
+            _logger = logger;
+            _reportTypeStorage = reportTypeStorage;
+        }
+
+        public bool Create(ReportTypeBindingModel model)
+        {
+            CheckModel(model);
+            if (_reportTypeStorage.Insert(model) == null)
+            {
+                _logger.LogWarning("Insert operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        public bool Delete(ReportTypeBindingModel model)
+        {
+            CheckModel(model, false);
+            _logger.LogInformation("Delete. Id:{Id}", model.Id);
+            if (_reportTypeStorage.Delete(model) == null)
+            {
+                _logger.LogWarning("Delete operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        public ReportTypeViewModel? ReadElement(ReportTypeSearchModel model)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            _logger.LogInformation("ReadElement. ReportTypeName: {Name}. Id:{Id}", model.Name, model.Id);
+            var element = _reportTypeStorage.GetElement(model);
+            if (element == null)
+            {
+                _logger.LogWarning("ReadElement element not found");
+                return null;
+            }
+            _logger.LogInformation("ReadElement find. Id:{Id}", element.Id);
+            return element;
+        }
+
+        public List<ReportTypeViewModel>? ReadList(ReportTypeSearchModel? model)
+        {
+            _logger.LogInformation("ReadList. ReportTypeName: {Name}. Id:{Id}", model?.Name, model?.Id);
+            var list = model == null ? _reportTypeStorage.GetFullList() : _reportTypeStorage.GetFilteredList(model);
+            if (list == null)
+            {
+                _logger.LogWarning("ReadList return null list");
+                return null;
+            }
+            _logger.LogInformation("ReadList. Count:{Count}", list.Count);
+            return list;
+        }
+
+        public bool Update(ReportTypeBindingModel model)
+        {
+            CheckModel(model);
+            if (_reportTypeStorage.Update(model) == null)
+            {
+                _logger.LogWarning("Update operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        private void CheckModel(ReportTypeBindingModel 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 типа отчета", nameof(model.Name));
+            }
+
+            _logger.LogInformation("ReportType. ReportName:{Name}. Id: { Id}", model.Name, model.Id);
+            var element = _reportTypeStorage.GetElement(new ReportTypeSearchModel
+            {
+                Name = model.Name,
+            });
+
+            if (element != null && element.Id != model.Id)
+            {
+                throw new InvalidOperationException("Тип отчета с таким названием уже есть");
+            }
+        }
+    }
+}
diff --git a/University/UniversityBuisnessLogic/BuisnessLogic/StatementLogic.cs b/University/UniversityBuisnessLogic/BuisnessLogic/StatementLogic.cs
new file mode 100644
index 0000000..e834537
--- /dev/null
+++ b/University/UniversityBuisnessLogic/BuisnessLogic/StatementLogic.cs
@@ -0,0 +1,101 @@
+using UniversityContracts.BindingModels;
+using UniversityContracts.BuisnessLogicContracts;
+using UniversityContracts.SearchModels;
+using UniversityContracts.StoragesContracts;
+using UniversityContracts.ViewModels;
+using Microsoft.Extensions.Logging;
+
+namespace UniversityBuisnessLogic.BuisnessLogic
+{
+    public class StatementLogic : IStatementLogic
+    {
+        private readonly ILogger _logger;
+        private readonly IStatementStorage _statementStorage;
+
+        public StatementLogic(ILogger<StatementLogic> logger, IStatementStorage statementStorage)
+        {
+            _logger = logger;
+            _statementStorage = statementStorage;
+        }
+        public bool Create(StatementBindingModel model)
+        {
+            CheckModel(model);
+            if (_statementStorage.Insert(model) == null)
+            {
+                _logger.LogWarning("Insert operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        public bool Delete(StatementBindingModel model)
+        {
+            CheckModel(model, false);
+            _logger.LogInformation("Delete. Id:{Id}", model.Id);
+            if (_statementStorage.Delete(model) == null)
+            {
+                _logger.LogWarning("Delete operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        public StatementViewModel? ReadElement(StatementSearchModel model)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            _logger.LogInformation("ReadElement. Id:{Id}", model.Id);
+            var element = _statementStorage.GetElement(model);
+            if (element == null)
+            {
+                _logger.LogWarning("ReadElement element not found");
+                return null;
+            }
+            _logger.LogInformation("ReadElement find. Id:{Id}", element.Id);
+            return element;
+        }
+        f
+        public List<StatementViewModel>? ReadList(StatementSearchModel? model)
+        {
+            _logger.LogInformation("ReadList. Id:{Id}", model?.Id);
+            var list = model == null ? _statementStorage.GetFullList() : _statementStorage.GetFilteredList(model);
+            if (list == null)
+            {
+                _logger.LogWarning("ReadList return null list");
+                return null;
+            }
+            _logger.LogInformation("ReadList. Count:{Count}", list.Count);
+            return list;
+        }
+
+        public bool Update(StatementBindingModel model)
+        {
+            CheckModel(model);
+            if (_statementStorage.Update(model) == null)
+            {
+                _logger.LogWarning("Update operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        private void CheckModel(StatementBindingModel model, bool withParams = true)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            if (!withParams)
+            {
+                return;
+            }
+            if (model.HoursCount <= 0)
+            {
+                throw new ArgumentNullException("Количество часов в ведомости должно быть больше 0", nameof(model.HoursCount));
+            }
+            _logger.LogInformation("Statement. HoursCount:{HoursCount}. Id: { Id}", model.HoursCount, model.Id);
+        }
+    }
+}
diff --git a/University/UniversityBuisnessLogic/BuisnessLogic/StudentLogic.cs b/University/UniversityBuisnessLogic/BuisnessLogic/StudentLogic.cs
new file mode 100644
index 0000000..08145a7
--- /dev/null
+++ b/University/UniversityBuisnessLogic/BuisnessLogic/StudentLogic.cs
@@ -0,0 +1,101 @@
+using UniversityContracts.BindingModels;
+using UniversityContracts.BuisnessLogicContracts;
+using UniversityContracts.SearchModels;
+using UniversityContracts.StoragesContracts;
+using UniversityContracts.ViewModels;
+using Microsoft.Extensions.Logging;
+
+namespace UniversityBuisnessLogic.BuisnessLogic
+{
+    public class StudentLogic : IStudentLogic
+    {
+        private readonly ILogger _logger;
+        private readonly IStudentStorage _studentStorage;
+
+        public StudentLogic(ILogger<StudentLogic> logger, IStudentStorage studentStorage)
+        {
+            _logger = logger;
+            _studentStorage = studentStorage;
+        }
+        public bool Create(StudentBindingModel model)
+        {
+            CheckModel(model);
+            if (_studentStorage.Insert(model) == null)
+            {
+                _logger.LogWarning("Insert operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        public bool Delete(StudentBindingModel model)
+        {
+            CheckModel(model, false);
+            _logger.LogInformation("Delete. Id:{Id}", model.Id);
+            if (_studentStorage.Delete(model) == null)
+            {
+                _logger.LogWarning("Delete operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        public StudentViewModel? ReadElement(StudentSearchModel model)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            _logger.LogInformation("ReadElement. StudentName: {Name}. Id:{Id}", model.Name, model.Id);
+            var element = _studentStorage.GetElement(model);
+            if (element == null)
+            {
+                _logger.LogWarning("ReadElement element not found");
+                return null;
+            }
+            _logger.LogInformation("ReadElement find. Id:{Id}", element.Id);
+            return element;
+        }
+
+        public List<StudentViewModel>? ReadList(StudentSearchModel? model)
+        {
+            _logger.LogInformation("ReadList. StudentName: {Name}. Id:{Id}", model?.Name, model?.Id);
+            var list = model == null ? _studentStorage.GetFullList() : _studentStorage.GetFilteredList(model);
+            if (list == null)
+            {
+                _logger.LogWarning("ReadList return null list");
+                return null;
+            }
+            _logger.LogInformation("ReadList. Count:{Count}", list.Count);
+            return list;
+        }
+
+        public bool Update(StudentBindingModel model)
+        {
+            CheckModel(model);
+            if (_studentStorage.Update(model) == null)
+            {
+                _logger.LogWarning("Update operation failed");
+                return false;
+            }
+            return true;
+        }
+        private void CheckModel(StudentBindingModel model, bool withParams = true)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            if (!withParams)
+            {
+                return;
+            }
+            if (string.IsNullOrEmpty(model.Name))
+            {
+                throw new ArgumentNullException("Нет имени студента", nameof(model.Name));
+            }
+
+            _logger.LogInformation("Student. Name:{Name}. Id: { Id}", model.Name, model.Id);
+        }
+    }
+}
diff --git a/University/UniversityBuisnessLogic/BuisnessLogic/UserLogic.cs b/University/UniversityBuisnessLogic/BuisnessLogic/UserLogic.cs
new file mode 100644
index 0000000..f59dbd0
--- /dev/null
+++ b/University/UniversityBuisnessLogic/BuisnessLogic/UserLogic.cs
@@ -0,0 +1,130 @@
+using UniversityContracts.BindingModels;
+using UniversityContracts.BuisnessLogicContracts;
+using UniversityContracts.SearchModels;
+using UniversityContracts.StoragesContracts;
+using UniversityContracts.ViewModels;
+using Microsoft.Extensions.Logging;
+
+namespace UniversityBuisnessLogic.BuisnessLogic
+{
+    public class UserLogic : IUserLogic
+    {
+        private readonly ILogger _logger;
+        private readonly IUserStorage _userStorage;
+
+        public UserLogic(ILogger<UserLogic> logger, IUserStorage userStorage)
+        {
+            _logger = logger;
+            _userStorage = userStorage;
+        }
+
+        public bool Create(UserBindingModel model)
+        {
+            CheckModel(model);
+            if (_userStorage.Insert(model) == null)
+            {
+                _logger.LogWarning("Insert operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        public bool Delete(UserBindingModel model)
+        {
+            CheckModel(model, false);
+            _logger.LogInformation("Delete. Id:{Id}", model.Id);
+            if (_userStorage.Delete(model) == null)
+            {
+                _logger.LogWarning("Delete operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        public UserViewModel? ReadElement(UserSearchModel model)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            _logger.LogInformation("ReadElement. Id:{Id}", model.Id);
+            var element = _userStorage.GetElement(model);
+            if (element == null)
+            {
+                _logger.LogWarning("ReadElement element not found");
+                return null;
+            }
+            _logger.LogInformation("ReadElement find. Id:{Id}", element.Id);
+            return element;
+        }
+
+        public List<UserViewModel>? ReadList(UserSearchModel? model)
+        {
+            _logger.LogInformation("ReadList. Id:{Id}", model?.Id);
+            var list = model == null ? _userStorage.GetFullList() : _userStorage.GetFilteredList(model);
+            if (list == null)
+            {
+                _logger.LogWarning("ReadList return null list");
+                return null;
+            }
+            _logger.LogInformation("ReadList. Count:{Count}", list.Count);
+            return list;
+        }
+
+        public bool Update(UserBindingModel model)
+        {
+            CheckModel(model);
+            if (_userStorage.Update(model) == null)
+            {
+                _logger.LogWarning("Update operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        private void CheckModel(UserBindingModel model, bool withParams = true)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            if (!withParams)
+            {
+                return;
+            }
+            if (string.IsNullOrEmpty(model.Name))
+            {
+                throw new ArgumentNullException("Нет имени пользователя", nameof(model.Name));
+            }
+            if (string.IsNullOrEmpty(model.Surname))
+            {
+                throw new ArgumentNullException("Нет фамилии пользователя", nameof(model.Name));
+            }
+            if (string.IsNullOrEmpty(model.Login))
+            {
+                throw new ArgumentNullException("Нет логина", nameof(model.Name));
+            }
+            if (string.IsNullOrEmpty(model.Password))
+            {
+                throw new ArgumentNullException("Нет фамилии пароля", nameof(model.Name));
+            }
+            else if (model.Password.Length < 6)
+            {
+                throw new ArgumentNullException("В пароле должно быть не менее 6 символов", nameof(model.Name));
+            }
+
+            _logger.LogInformation("User. Name:{Name}. Surname:{Surname}. Login: {Login} " +
+                                   "Password: {Password}. Id: {Id}", model.Name, model.Surname, model.Login, model.Password, model.Id);
+
+            var element = _userStorage.GetElement(new UserSearchModel
+            {
+                Login = model.Login,
+            });
+
+            if (element != null && element.Id != model.Id)
+            {
+                throw new InvalidOperationException("Пользователь с таким логином уже есть");
+            }
+        }
+    }
+}