asp.net - Calendar Custom Validator

Question

Can someone suggest how to implement a custom validator for a Web Forms Calendar control? Apparently, neither RequiredValidator nor CustomValidator work out of the box with the Calendar control.

One solution offered by Microsoft is to extend the Calendar:

How to extend a Web form control to work with the validation controls by using Visual C#

Is there not a simpler solution?

Answer 1

I finally got it to work this way:

<asp:Calendar ID="startCalendar" CssClass="startDate" 
    OnSelectionChanged="Selection_Changed" runat="server"></asp:Calendar>
<asp:CustomValidator ID="dateCustVal" OnServerValidate="DateCustVal_Validate" 
    runat="server"></asp:CustomValidator>

protected void DateCustVal_Validate(object source, ServerValidateEventArgs args)
{            
    if (startCalendar.SelectedDate == null 
        || startCalendar.SelectedDate == new DateTime(0001, 1, 1, 0, 0, 0))
    {
        args.IsValid = false;
    }
    else
    {
        args.IsValid = true;
    }
}