diff --git a/CarService/CarServiceBusinessLogic/BusinessLogics/WorkerLogic.cs b/CarService/CarServiceBusinessLogic/BusinessLogics/WorkerLogic.cs
index 82636e7..33a3e7a 100644
--- a/CarService/CarServiceBusinessLogic/BusinessLogics/WorkerLogic.cs
+++ b/CarService/CarServiceBusinessLogic/BusinessLogics/WorkerLogic.cs
@@ -67,7 +67,7 @@ namespace CarServiceBusinessLogic.BusinessLogics
 		public bool Delete(WorkerBindingModel model)
 		{
 			CheckModel(model, false);
-			_logger.LogInformation("Delete. Id:{Id}", model.Id);
+			_logger.LogInformation("Delete. Id: {Id}", model.Id);
 			if (_workerStorage.Delete(model) == null)
 			{
 				_logger.LogWarning("Delete operation failed");
@@ -79,12 +79,70 @@ namespace CarServiceBusinessLogic.BusinessLogics
 		{
 			if (model == null)
 			{
-				throw new ArgumentNullException(nameof(model));
+				throw new ArgumentException(nameof(model));
 			}
 			if (!withParams)
 			{
 				return;
 			}
+			//Введён ли логин?
+			if (string.IsNullOrEmpty(model.Login))
+			{
+				_logger.LogWarning("Login is empty");
+				throw new ArgumentException("Не введён логин");
+			}
+			//Логин не должен быть больше 30 символов
+			if (model.Login.Length > 30)
+			{
+				_logger.LogWarning("Login {Login} length > 30", model.Login);
+				throw new ArgumentException("Длина логина не должна превышать 30 символов");
+			}
+			//Проверяем логин на уникальность
+			var existingWorker = _workerStorage.GetElement(new()
+			{
+				Login = model.Login
+			});
+			if (existingWorker != null)
+			{
+				_logger.LogWarning("Worker with login {Login} already exists", model.Login);
+				throw new ArgumentException("Сотрудник с таким логином уже существует");
+			}
+			//Введён ли пароль?
+			if (string.IsNullOrEmpty(model.Password))
+			{
+				_logger.LogWarning("Password is empty");
+				throw new ArgumentException("Не введён пароль");
+			}
+			//Пароль не должен быть менее 7 и более 30 символов
+			if (model.Password.Length < 7 || model.Password.Length > 30)
+			{
+				_logger.LogWarning("Password {Password} length > 30 or < 7", model.Password);
+				throw new ArgumentException("Длина пароля должна быть в промежутке между 7 и 30 символами");
+			}
+			//Введено ли имя?
+			if (string.IsNullOrEmpty(model.Name))
+			{
+				_logger.LogWarning("Name is empty");
+				throw new ArgumentException("Не введёно имя");
+			}
+			//Имя должно быть не более 30 символов
+			if (model.Name.Length > 30)
+			{
+				_logger.LogWarning("Name {Name} length > 30", model.Name);
+				throw new ArgumentException("Длина имени не должна превышать 30 символов");
+			}
+			//Введена ли фамилия?
+			if (string.IsNullOrEmpty(model.Surname))
+			{
+				_logger.LogWarning("Surname is empty");
+				throw new ArgumentException("Не введёна фамилия");
+			}
+			//Фамилия должна быть не более 30 символов
+			if (model.Surname.Length > 30)
+			{
+				_logger.LogWarning("Surname {Surname} length > 30", model.Surname);
+				throw new ArgumentException("Длина фамилии не должна превышать 30 символов");
+			}
 			_logger.LogInformation("Worker. Id: {Id}", model.Id);
 		}
 	}
diff --git a/CarService/CarServiceContracts/SearchModels/WorkerSearchModel.cs b/CarService/CarServiceContracts/SearchModels/WorkerSearchModel.cs
index f130d89..6098efd 100644
--- a/CarService/CarServiceContracts/SearchModels/WorkerSearchModel.cs
+++ b/CarService/CarServiceContracts/SearchModels/WorkerSearchModel.cs
@@ -3,5 +3,13 @@
 	public class WorkerSearchModel
 	{
 		public int? Id { get; set; }
+		/// <summary>
+		/// Поиск клиента по логину для проверки логина на уникальность и для входа
+		/// </summary>
+		public string? Login { get; set; }
+		/// <summary>
+		/// Поиск клиента по паролю для входа
+		/// </summary>
+		public string? Password { get; set; }
 	}
 }
diff --git a/CarService/CarServiceDatabase/Implements/WorkerStorage.cs b/CarService/CarServiceDatabase/Implements/WorkerStorage.cs
index 5e734b5..c3f287b 100644
--- a/CarService/CarServiceDatabase/Implements/WorkerStorage.cs
+++ b/CarService/CarServiceDatabase/Implements/WorkerStorage.cs
@@ -21,14 +21,25 @@ namespace CarServiceDatabase.Implements
 		public WorkerViewModel? GetElement(WorkerSearchModel model)
 		{
 			using var context = new CarServiceDbContext();
-			return context.Workers.FirstOrDefault(x=> x.Id == model.Id)?.GetViewModel;
+			if (model.Id.HasValue)//Сначала ищем по Id
+			{
+				return context.Workers.FirstOrDefault(x => x.Id == model.Id)?.GetViewModel;
+			}
+			else if (!string.IsNullOrEmpty(model.Login) && string.IsNullOrEmpty(model.Password))//Затем по логину (для проверки уникальности)
+			{
+				return context.Workers.FirstOrDefault(x => x.Login == model.Login)?.GetViewModel;
+			}
+			else if (!string.IsNullOrEmpty(model.Login) && !string.IsNullOrEmpty(model.Password))//Затем по логину и паролю (для входа)
+			{
+				return context.Workers.FirstOrDefault(x => x.Login == model.Login && x.Password == model.Password)?.GetViewModel;
+			}
+			return null;
 		}
 		public WorkerViewModel? Insert(WorkerBindingModel model)
 		{
-			//TODO проверка на униКАЛьность
 			using var context = new CarServiceDbContext();
 			var newWorker = Worker.Create(model);
-			if(newWorker != null)
+			if (newWorker != null)
 			{
 				context.Workers.Add(newWorker);
 				context.SaveChanges();
@@ -38,11 +49,27 @@ namespace CarServiceDatabase.Implements
 		}
 		public WorkerViewModel? Update(WorkerBindingModel model)
 		{
-			throw new NotImplementedException();
+			using var context = new CarServiceDbContext();
+			var worker = context.Workers.FirstOrDefault(x => x.Id == model.Id);
+			if (worker == null)
+			{
+				return null;
+			}
+			worker.Update(model);
+			context.SaveChanges();
+			return worker.GetViewModel;
 		}
 		public WorkerViewModel? Delete(WorkerBindingModel model)
 		{
-			throw new NotImplementedException();
+			using var context = new CarServiceDbContext();
+			var worker = context.Workers.FirstOrDefault(x => x.Id == model.Id);
+			if (worker == null)
+			{
+				return null;
+			}
+			context.Workers.Remove(worker);
+			context.SaveChanges();
+			return worker.GetViewModel;
 		}
 	}
 }
diff --git a/CarService/CarServiceDatabase/Models/Worker.cs b/CarService/CarServiceDatabase/Models/Worker.cs
index 17945c8..da0ff0f 100644
--- a/CarService/CarServiceDatabase/Models/Worker.cs
+++ b/CarService/CarServiceDatabase/Models/Worker.cs
@@ -42,17 +42,6 @@ namespace CarServiceDatabase.Models
 				Surname = model.Surname
 			};
 		}
-		public static Worker Create(WorkerViewModel model)
-		{
-			return new()
-			{
-				Id = model.Id,
-				Login = model.Login,
-				Password = model.Password,
-				Name = model.Name,
-				Surname = model.Surname
-			};
-		}
 		public void Update(WorkerBindingModel? model)
 		{
 			if (model == null)
diff --git a/CarService/CarServiceView/FormRegistrationWorker.cs b/CarService/CarServiceView/FormRegistrationWorker.cs
index 2ca35f1..02e9aec 100644
--- a/CarService/CarServiceView/FormRegistrationWorker.cs
+++ b/CarService/CarServiceView/FormRegistrationWorker.cs
@@ -15,13 +15,20 @@ namespace CarServiceView
 		}
 		private void buttonRegister_Click(object sender, EventArgs e)
 		{
-			_workerLogic.Create(new()
+			try
 			{
-				Login = textBoxLogin.Text,
-				Password = textBoxPassword.Text,
-				Name = textBoxName.Text,
-				Surname= textBoxSurname.Text
-			});
+				_workerLogic.Create(new()
+				{
+					Login = textBoxLogin.Text,
+					Password = textBoxPassword.Text,
+					Name = textBoxName.Text,
+					Surname = textBoxSurname.Text
+				});
+			}
+			catch (Exception ex)
+			{
+				MessageBox.Show(ex.Message, "Ошибка", MessageBoxButtons.OK, MessageBoxIcon.Error);
+			}
 		}
 	}
 }