sorting problem in outlook

[C# Programming]

Hi,
Whenever I tried to sort the mail item, it does not effect.



Microsoft.Office.Interop.Outlook.MAPIFolder mItem = TraverseTee(outlook.Session.Folders, "myfolder");

if(mItem!=null)
{
mItem.Items.Sort("Received", false);
int i=0;
foreach(Microsoft.Office.Interop.Outlook.MailItem item in mItem.Items)
{
listBox1.Items.Insert(i,item.Subject);
i++;
}
}