HOW TO USE ASP.NET AJAX CALENDAR CONTROL EXTENDER

1)  Create WebSite

2) Add aspx page

3) Add toolkitscript manager

4) Add  TextBox Control  

5) Add Calendar Control Extender.

asp:CalendarExtender   PROPERTIES
1) TARGET CONTROL ID
2) FORMAT (CHANGE BASED ON CULTURE)
3) REMAINING PROPERTIES ARE OPTIONAL

In this example Employee Should be More than 18yrs old.

so  set StartDate and SelectedDate Properties





        <b>Select Date Of Birth </b><asp:TextBox ID="txtDOB" runat="server"></asp:TextBox>
        <asp:CalendarExtender ID="CalendarExtender1" runat="server"
         TargetControlID="txtDOB" Animated="true" Format="dd/MMM/yyyy"
          PopupPosition="BottomRight" ClearTime="True" TodaysDateFormat="MMM dd yyyy"
           EnabledOnClient="true" FirstDayOfWeek="Monday"></asp:CalendarExtender>

6) Programatically set the EndDate and so SelectedDate also.

        if (!IsPostBack)

        {

           // CalendarExtender1.StartDate = DateTime.Now.AddYears(-30);

            CalendarExtender1.EndDate = DateTime.Now.AddYears(-18); ;

            //CalendarExtender1.DefaultView = AjaxControlToolkit.CalendarDefaultView.Days;

            CalendarExtender1.SelectedDate = DateTime.Now.AddYears(-18);

        }

7)  Run the ASPX Page

Here is the output