Can't set CommandBarButton Tag property?   

I'm getting an exception on the marked line (comment) in the following code 
in my add-in, which seems to be correctly written. I know I'm missing 
something, probably something simple. I'm trying to add a button control as 
the next to last item on the menu. As you can see, I want the Click handler 
to know which folder was right-clicked on to execute the command.

***** begin code *****

public void OnConnection( object application, Extensibility.ext_ConnectMode 
connectMode, object addInInst, ref System.Array custom )
{
    applicationObject = (Outlook.Application)application;
    addInInstance = addInInst;

    applicationObject.FolderContextMenuDisplay += new 
Microsoft.Office.Interop.Outlook.ApplicationEvents_11_FolderContextMenuDisplayEventHandler( 
applicationObject_FolderContextMenuDisplay );
}

void applicationObject_FolderContextMenuDisplay( 
Microsoft.Office.Core.CommandBar commandBar, 
Microsoft.Office.Interop.Outlook.MAPIFolder folder )
{
    CommandBarButton button = (CommandBarButton)commandBar.Controls.Add( 
MsoControlType.msoControlButton, 1, Type.Missing, 
commandBar.Controls.Count - 1, true );
    // Exception occurs on next line:
    button.Tag = folder.EntryID + ";" + folder.StoreID;
    button.Caption = "My Command";
}

***** end code *****

The specific exception (e.Message) is:

The parameter is incorrect. (Exception from HRESULT: 0x80070057 
(E_INVALIDARG))

date: Wed, 14 Jun 2006 12:11:41 -0500   author:   280Z28

Re: Can't set CommandBarButton Tag property?   

Well, it seems the string was too long (that's my guess). When I set it to 
just folder.EntryID, it worked. Maybe the exception message could be made 
more informative.

"280Z28"  wrote in message 
news:O8Z8bW9jGHA.3440@TK2MSFTNGP02.phx.gbl...
> I'm getting an exception on the marked line (comment) in the following 
> code in my add-in, which seems to be correctly written. I know I'm missing 
> something, probably something simple. I'm trying to add a button control 
> as the next to last item on the menu. As you can see, I want the Click 
> handler to know which folder was right-clicked on to execute the command.
>
> ***** begin code *****
>
> public void OnConnection( object application, 
> Extensibility.ext_ConnectMode connectMode, object addInInst, ref 
> System.Array custom )
> {
>    applicationObject = (Outlook.Application)application;
>    addInInstance = addInInst;
>
>    applicationObject.FolderContextMenuDisplay += new 
> Microsoft.Office.Interop.Outlook.ApplicationEvents_11_FolderContextMenuDisplayEventHandler( 
> applicationObject_FolderContextMenuDisplay );
> }
>
> void applicationObject_FolderContextMenuDisplay( 
> Microsoft.Office.Core.CommandBar commandBar, 
> Microsoft.Office.Interop.Outlook.MAPIFolder folder )
> {
>    CommandBarButton button = (CommandBarButton)commandBar.Controls.Add( 
> MsoControlType.msoControlButton, 1, Type.Missing, 
> commandBar.Controls.Count - 1, true );
>    // Exception occurs on next line:
>    button.Tag = folder.EntryID + ";" + folder.StoreID;
>    button.Caption = "My Command";
> }
>
> ***** end code *****
>
> The specific exception (e.Message) is:
>
> The parameter is incorrect. (Exception from HRESULT: 0x80070057 
> (E_INVALIDARG))
>
>

date: Wed, 14 Jun 2006 12:59:17 -0500   author:   280Z28