windows phone 8 toolkit contextmenu change menuitem header text dynamically

MenuItem item = menu.FindName("ContextMenuItemToggleReporting") as MenuItem;// .Single(i=>((MenuItem)item).Name == "ContextMenuItemToggleReporting") as MenuItem;
            if ([you condition logic here. e.g. MyEntity.IsReportingEnabled])
            {
                item.Header = "Disable Reporting";
            }
            else
            {
                item.Header = "Enable Reporting";
            }