ObjectModel.EmployeeCollection.Add C# (CSharp) Method

		internal void Add(Employee employee)
		{
			if (null == employee)
			{
				throw new ArgumentNullException("employee");
			}

			lock (InnerList.SyncRoot)
			{
				InnerList.Add(employee);
			}
		}
	}

 internal void AddEmployee(Employee employee)
 {
     employee.Department = this;
     _employees.Add(employee);
 }