public IHttpActionResult UpdateEmployee(int employeeId, EmployeeDto updatedEmployeeDto)
 {
     var employee = context.Employees
         .Single(e => e.Id == employeeId);
     employee.FirstName = updatedEmployeeDto.FirstName;
     employee.LastName = updatedEmployeeDto.LastName;
     employee.DayOfBirth = updatedEmployeeDto.DayOfBirth;
     employee.EmailAddress = updatedEmployeeDto.EmailAddress;
     employee.DepartmentId = updatedEmployeeDto.DepartmentId;
     context.SaveChanges();
     return Ok(updatedEmployeeDto);
 }
 public IHttpActionResult AddEmployee(EmployeeDto newEmployeeDto)
 {
     var newEmployee = new Employee
     {
         FirstName = newEmployeeDto.FirstName,
         LastName = newEmployeeDto.LastName,
         DayOfBirth = newEmployeeDto.DayOfBirth,
         EmailAddress = newEmployeeDto.EmailAddress,
         DepartmentId = newEmployeeDto.DepartmentId,
         AvailableSince = DateTime.Now
     };
     context.Employees.Add(newEmployee);
     context.SaveChanges();
     return Ok(newEmployeeDto);
 }