public static void Remove(Employee employee)
 {
     Employee target = One(o => o.EmployeeID == employee.EmployeeID);
     if (target != null)
     {
         GetAll().Remove(target);
     }
 }
 public static void Update(Employee employee)
 {
     Employee target = One(o => o.EmployeeID == employee.EmployeeID);
     if (target != null)
     {
         target.EmployeeID = employee.EmployeeID;
         target.Name = employee.Name;
     }
 }
        public static void Insert(Employee employee)
        {
            employee.EmployeeID = GetAll().OrderByDescending(p => p.EmployeeID).First().EmployeeID + 1;

            GetAll().Insert(0, employee);
        }