Create Dynamic AJAX Control - Calendar Extender

If you want to create Ajax Control Toolkit- Calendar Extender please follow
code below:

// Create a textbox to hold the date
TextBox dateValue = new TextBox();
dateValue.ID = "dateValue";

// Create the calendar extender
AjaxControlToolkit.CalendarExtender ajaxCalendar =
  new AjaxControlToolkit.CalendarExtender();
ajaxCalendar.ID = "ajaxCalendar";
ajaxCalendar.Format = "MM/dd/yyyy";
ajaxCalendar.TargetControlID = dateValue.ID;

placeHolder1.Controls.Add(dateValue);
placeHolder1.Controls.Add(ajaxCalendar);

In the ASPX, I have just a simple PlaceHolder where I append the dynamically created controls:

<asp:placeholder id="placeHolder1" runat="server">
asp:placeholder>

Please see picture below: