How to validate date format of MM/dd/yyyy, am using ajax toolkit CalendarExtender for date picking, if able to validate the format of date in case not match want to show error msg Invalid date
<asp:TextBox ID="txtDate" CssClass="form-control" runat="server" /> <cc1:CalendarExtender ID="CalendarExtender1" PopupButtonID="txtDate" runat="server" TargetControlID="txtDate" Format="MM/dd/yyyy"></cc1:CalendarExtender>