Transferring back from destination listbox in code not working correctly

[Bex]

Hi

I have two list boxes on my Page.
When the page loads depending on the type of user, an item from the left listbox is transferred to the right listbox.
The user can then transfer anything else from left to right.

If an option is changed on the page, everything from the right needs to be transferred back to the left.

I copied the example and have listboxes on my page like this:

<telerik:RadListBox runat="server" ID="lstLeft" Height="200px" Width="200px" AllowTransfer="true" TransferToID="lstRight"/>
<telerik:RadListBox runat="server" ID="lstRight" Height="200px" Width="200px" />

Transferring initially from left to right woks fine using this:

lstLeft.Transfer(listItem , lstLeft, lstRight);

If I try it the other way round (to transfer back to the left) :

lstRight.Transfer(listItem, lstRight, lstLeft);

I get the following error:
Specified argument was out of the range of valid values.
Parameter name: sourceListBox 

If I add AllowTransfer="true" TransferToID="lstLeft" to the right hand textbox the transfer works, but I get the transfer buttons to the right of the right list box as well as in between.

What do I need to do to get this to work correctly?

Bex

[Bex]

Anyone? 

[Peter Filipov]

Hi Bex,

I've already answered your support ticket. To avoid duplication of the thread please let us continue our communication in a single thread.

Regards,
Peter Filipov
the Telerik team

[James]

Hi.

I was wondering what the answer to this is.  I am attempting to do the same thing and getting the same results.

[Steve]

Hi James

I can't remember exactly what was happening but my post back from telerik says:
 If transfer is not allowed it is not possible to transfer items. To transfer items AllowTransfer and TransferToID properties should be set
Does that make any sense or help at all?

Bex

[James]

Hi Bex.

Thanks for replying.  I Do have those properties set and still couldnt get it to work.  What I needed to do was to move values back from where the user selected them.  I got around this issue by cloning the item, addding it to the list box it originally belonged to and then clearing out the listbox that needed to be cleared.  Here is the code I used:

 

 

RadListBoxItemCollection theList = radUserRecipientList.Items;

 

 

 

foreach (RadListBoxItem theItem in theList)

 

{

 

 

 

    RadListBoxItem itemToMove = theItem.Clone();

 

    radUserList.Items.Add(itemToMove);

}

radUserRecipientList.Items.Clear();

radUserList.Sort =

 

RadListBoxSort.Ascending;

 

radUserList.SortItems();

[Peter Filipov]

Hello guys,

I am sending you the sample project from the support ticket.

Regards,
Peter Filipov
the Telerik team

[Terry Hoiness]

I was trying to figure this out as well.  The following does the ground work for you - even if you're looking for something different, the idea's the same (you should be able to pick up the model of the two methods - it's simple).  

1.  Catch the original transfer state
2.  Set AllowTransfer to true
3.  Set the transfer ID from source to destination
4.  Perform the transfer.
5.  Set AllowTransfer back to the original state.

//Reset all selected back to source

     private void ResetList(RadListBox ListSource, RadListBox ListDestination)

     {

         bool allowTransfer = ListSource.AllowTransfer;

         ListSource.AllowTransfer = true;

         ListSource.TransferToID = ListDestination.ID;

         if (ListSource.Items.Count > 0)
ListSource.Transfer(ListSource.Items, ListSource, ListDestination);

         ListSource.AllowTransfer = allowTransfer;

     }

//Move items by value

private void MoveListItems(RadListBox ListSource, RadListBox ListDestination, List<int?> values)

{

    bool allowTransfer = ListSource.AllowTransfer;

    ListSource.AllowTransfer = true;

    ListSource.TransferToID = ListDestination.ID;

    foreach (int value in values)

         ListSource.Transfer(ListSource.FindItemByValue(value.ToString()), ListSource, ListDestination);

    ListSource.AllowTransfer = allowTransfer;

}