1if (!inventoryList.Fields.ContainsField("RegistrationFields"))
2{
3 SPField f = inventoryList.Fields.CreateNewField("ListColumnPicker", "RegistrationFields");
4 ListColumnPickerField lcpf = f as ListColumnPickerField;
5 lcpf.ListId = registrationsList.ID.ToString();
6 inventoryList.Fields.Add(lcpf as SPField);
7}