Date validation

Hi all,


I have a textbox where user can enter issue date of credit card. I want to make sure that whatever date user enters is a valid date and not greater than today. I have used compare validator, it validates fine if user enters wrong date. but how to apply check that date entered is less than today. I have used folloing validator


<asp:CompareValidator ID="CompareValidator1" runat="server" ErrorMessage="Invalid date"
                                                    Display="Dynamic" Operator="DataTypeCheck" Type="Date" ControlToValidate="txtIssueDate"></asp:CompareValidator>


R ...