How to Check If An Ajax Tab Is Empty Using C#

hi all,

I want to check whether the ajax tab is empty, if there is nothing inside the ajax tab, I want to display "no content found" label message. My ajax tab is being populated dynamically in C# in this way:

 public void BindChart()
        {
            //Create new TabContainer
            AjaxControlToolkit.TabContainer container = new AjaxControlToolkit.TabContainer();
            container.ID = "TabContainer";
            container.EnableViewState = false;
            container.Tabs.Clear();

                    AjaxControlToolkit.TabPanel panel = new AjaxControlToolkit.TabPanel();
                    panel.HeaderText += item.Text;
                    container.Tabs.Add(panel);

Question: How to check if any ajax tab is empty/has no content then add in a label in that empty tab?

Thanks.