/// <summary>
        /// Construct
        /// </summary>
        /// <param name="_employeeList"></param>
        public EmployeeListViewModel(EmployeeRespository employeeRespository)
        {
            if (employeeRespository == null)
            { throw new ArgumentNullException("employeeRespository"); }

            _employeeRespository = employeeRespository;
            this.AllEmployees = new ObservableCollection<Model.Employee>(_employeeRespository.GetEmployee());
        }
        /// <summary>
        /// Construct
        /// </summary>
        /// <param name="_employeeList"></param>
        public EmployeeListViewModel(EmployeeRespository employeeRespository)
        {
            if (employeeRespository == null)
            {
                throw new ArgumentNullException("employeeRespository");
            }

            _employeeRespository = employeeRespository;
            this.AllEmployees    = new ObservableCollection <Model.Employee>(_employeeRespository.GetEmployee());
        }