Ajax Calendar Control in Asp.Net..some time date could not be changed..

try this Link

AJAX-Control-Toolkit-Calendar-Extender.aspx[^]

<ajaxToolkit:CalendarExtender ID="CalendarExtender1" runat="server" PopupPosition="Right" PopupButtonID="TextBox2"
    TargetControlID="TextBox1">
</ajaxToolkit:CalendarExtender>
<ajaxToolkit:CalendarExtender ID="CalendarExtender2" runat="server" PopupPosition="Right" PopupButtonID="Image2"
    TargetControlID="TextBox2" Format="dddd, MMMM dd, yyyy">
</ajaxToolkit:CalendarExtender>


You need to give popup button id like On click of textbox or any other Button on Click of which calendor will PopUp.  PopupButtonID="TextBox2" Or PopupButtonID="Image2"

please check that u set any values to control on page load .

Thanks for You Reply I think u want to insert Calender value in database

for that on click button change you code for date as follows:

DateTime DOB = DateTime.ParseExact(txtbx_Preferred_Day.Text, "dd/MM/yyyy", null);
and make
<asp:TextBox runat="server" Width="150px" ID="txtbx_Preferred_Day"/> <ajaxToolkit:calendarextender TargetControlID="txtbx_Preferred_Day" Format="dd/MM/yyyy" ID="cldr_Prefferd_Day" runat="server">

as same