Delete dynamically generated CheckBoxes c#

I am generating dynamically Chechbox-buttons on a panel according to my SQL data.I created a button to "refresh" my buttons, I mean I delete / update buttons . My problem is i cannot delete the old buttons. After a created the buttons I am trying to delete a specific one:

foreach (CheckBox item in panel.Controls.OfType<CheckBox>())
            {
              if (item.Name == "something")  
               {
                 panel.Controls.Remove(item);
               }  
            } 

There are only few deleted . Any suggestion...