or
protected void valGroup_ServerValidate(object source, ServerValidateEventArgs args) { try { if (this.groups.SelectedValue == "*" && string.IsNullOrEmpty(this.group.Text)) args.IsValid = false; else args.IsValid = true; } catch (Exception ex) { throw ex; } }

<telerik:RadRotator ID="thumbRotator" runat="server" WrapFrames="false" RotatorType="ButtonsOver" UseSmoothScroll="True" Width="572px" Height="119" ItemWidth="145" FrameDuration="1" ScrollDirection="Left,Right" OnItemClick="ShowImage" OnClientLoad="OnRotatorLoad" > <ItemTemplate> <img src='<%# DataBinder.Eval(Container.DataItem, "Image") %>' alt='gallery image' height='104' class="rotatorimage" /> </ItemTemplate> <ControlButtons LeftButtonID="img_left" RightButtonID="img_right" /></telerik:RadRotator>

