My C# isn't great so please bear with me!

I have a query regarding maintaining a List in between two windows forms. It's for a project where I need to create an address book.

I have chosen to maintain the contact details in the form of a List. My first windows form (form1) contains a master copy of a list AddressBook, which contains the address book. I hardcoded 4 entries into the address book list in order to experiment and get the simple functions such as 'add' and 'edit' working.

I have a second windows form called Add, in which I can add new entries to the list. This works fine. I can add a new contact in the ADD form and this shows up in the initial form1, master form.

My problem arises in the EDIT form. I pass the AddressBook (master) list to the EDIT form. The EDIT form takes the master list and I am able to manipulate the records in that list. However when it comes to sending back the new list to the master page (form1), it does not pick it up. I am using the same code as I do in the ADD form which successfully sends back the new list. However this code does not work when sending back an edited list.

Here is my AddressBook property within form1

publicList<Contact> addressBook;publicList<Contact>AddressBook{

       get {return addressBook;}set{addressBook = value;}}

Within EDIT:

publicEdit(){InitializeComponent();
        temp =Master.AddressBook;// temp is the temporary List I update within EDIT         }

** I then have my algorithm which successfully lets me EDIT the list temp. the list temp now has the edited list**

then when I hit the save button, I use the following code;

Master.AddressBook= temp;

All I need is for the list temp to be sent back to form1.

the code Master.AddressBook = temp; WORKS for when I add values to the list through the ADD form.

ADD FORM:

publicAdd(){InitializeComponent();
        temp =Master.AddressBook;}**** code to add a new record into the list temp. the new record is called newRecord**********privatevoid btnAddClose_Click(object sender,EventArgs e){
        stor.AddressBook= temp;// when I hit close on the form, it updates the master     list AddressBook this.Close();}

This is all probably very poorly worded but in essence the only bit where my code fails is when I want to change my master Addressbook within form1 by replacing it with the list temp, which is the edited list from my EDIT form.

I think it's something to do with my AddressBook property. But this doesn't explain why I can replace AddressBook with a list containing new records but I can't replace it with a list containing edited records.