or
<li> <asp:Label ID="lbDOB" runat="server" Text="Date of Birth: (dd/mm/yyyy)" AssociatedControlID="txtDOB" Height="35px" Width="300px"></asp:Label> <telerik:RadDatePicker ID="txtDOB" runat="server" DateFormat="dd/MM/yyyy" Culture="English (United Kingdom)" Width="125px" MinDate="01/01/1950 00:00:00" > </telerik:RadDatePicker> <asp:Button ID="btnSearch" runat="server" CausesValidation="true" Text="Search" onclick="btnSearch_Click" /> <asp:RequiredFieldValidator ID="RFV_txtDOB" runat="server" ControlToValidate="txtDOB" ErrorMessage="Please enter DOB" ValidationGroup="DateValidate" Font-Size="Large" SetFocusOnError="true" Display="dynamic">*</asp:RequiredFieldValidator> </li>