ajaxcalendar control not working in asp.net

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ASP.NET

I have created a master page and i am using ajax calendar control for date. I have added ajax calendar control to date textbox. But when I run this, the calendar is not showing. When I click on the text box it is not showing the calendar. What is the problem? Please help.

Here is my code-

<td class="auto-style2"><asp:TextBox ID="txtdob" runat="server" Width="161px" CausesValidation="True" Height="19px">
    <asp:ScriptManager ID="ScriptManager1" runat="server" > 
    <cc1:CalendarExtender ID="txtdob_CalendarExtender"  runat="server" Enabled="True" TargetControlID="txtdob" Format="mm/dd/yyyy" >
    
</td>