update panel with validation and file upload

hi
im try to make the validation and file upload work once its on update panel

<asp:UpdatePanel ID="UpdatePanel1" runat="server"> <ContentTemplate> <asp:FileUpload ID="cprcard" runat="server" /> <asp:RequiredFieldValidator ID="RequiredFieldValidator11" runat="server" ErrorMessage="require" ForeColor="Red" ControlToValidate="cprcard" SetFocusOnError="true" ></asp:RequiredFieldValidator> <br /><br /> <asp:FileUpload ID="staffcard" runat="server" /> <asp:RequiredFieldValidator ID="RequiredFieldValidator12" runat="server" ErrorMessage="require" ForeColor="Red" ControlToValidate="staffcard" SetFocusOnError="true&qu ...