asp validator - determine if age is within range - asp.net

Question

Using a asp validator, is there a way to verify the date of birth that is entered is within an age range, say 5 and 22 years old?
I currently do a asp:compareValidator and a asp:rangeValidator, but i need to add another level of range validation for current date against the value entered in the textbox to notify that the age is outside the range allowed (5 and 22 years old only)
thanks
tony

Answer 1

You could use an ASP.NET CustomValidator for this. In your ASP.NET code, you add the following control:
<asp:CustomValidator runat="server" id="ageByDateCheck"
ControlToValidate="txtDate"
OnServerValidate="CheckAgeByDate"
ErrorMessage="You are not between the ages of 5 and 22." />
And in your code-behind, you'd have a new method for checking the age.
public void CheckAgeByDate(object source, ServerValidateEventArgs args)
{
var date = DateTime.Parse(args.Value);
args.IsValid = true; //Replace this with your age check algorithm.
}
EDIT
If you're looking for client-side validation, you'll have to create some javascript to do your validation and specify it in the control's ClientValidation field. So your ASP.NET control now looks something like this:
<asp:CustomValidator runat="server" id="ageByDateCheck"
ControlToValidate="txtDate"
OnServerValidate="CheckAgeByDate"
ClientValidation="ClientValidate"
ErrorMessage="You are not between the ages of 5 and 22." />
Your probably don't have to have a different name for that, but I tend to keep things separate for code sanity.
For your javascript:
<script language="javascript">
function ClientValidate(source, arguments)
{
var date = new Date(arguments.Value); //make sure it's something javascript can parse
//validate age here
arguments.IsValid = isValid(date);
}
</script>