Ajax Tool Kit Error

Hi Everybody,

I m getting this errot when I try to execute my website .

Compilation Error

Description:An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately.

Compiler Error Message: CS0117: 'AjaxControlToolkit.CalendarExtender' does not contain a definition for 'StartDate'

Source Error:

Line 15: 
Line 16:         //MediaPlayer1.MediaSource = "~/files/Wildlife.wmv";Line 17: CalendarExtender1.StartDate = DateTime.Today; Line 18:         CalendarExtender1.EndDate = DateTime.Today.AddMonths(2);
Line 19:         CalendarExtender2.StartDate = DateTime.Today.AddDays(1);

Source File: d:\inetpub\vhosts\kodact.com\busbee\CustomerHome.aspx.cs    Line: 17

I m using the below prefix, still it is showing the error.

<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="asp" %>

Thanks in Advance.